Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad54ec2a6823d1a5…

MALICIOUS

PDF

85.7 KB Created: 2021-03-12 17:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6937cee9a2ec0146b80e72a549d39a56 SHA-1: 0e8131350ed2ec8d6750760f11acfc212d67d923 SHA-256: ad54ec2a6823d1a53fb5b1aa9ab7a8a77ad352c8a241bc2471355f56ab326396
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, and is flagged by ClamAV as Pdf.Phishing.Trojan. The primary URL, 'https://botokaw.ru/award?keyword=sample+aptitude+test+for+employment+with+answers+pdf', suggests a lure related to employment tests. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/award?keyword=sample+aptitude+test+for+employment+with+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/jirudumom/gqKtjiP/laxisopisivu.pdfIn PDF document text
    • http://volulolusawaz.mygamesonline.org/cirrosis_hepatica_tratamiento.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/dAihLn7/bivolo.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/pastilla_reveladora_de_placa_bacteriana.pdfIn PDF document text
    • http://lizuzezusad.medianewsonline.com/interior_and_exterior_angles_of_polygons_worksheet_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fe5b7cf30a77.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/gi6idC7/toca_life_hospital_apk_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490273/normal_5fecf1b4e08a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d53d3a2-9186-4699-bf30-e763fe94bbe5/aircraft_maintenance_jobs_overseas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7140fab5-ad8e-4a8e-84e9-89d706617760/safety_razor_vs_straight_razor_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3c1393-8dd1-495e-846c-071bd1a34412/nulegakinis.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_d515e3e7ee8a44d980fca7060d4d774e.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_b85b6e89e59146f6b436405725be6f03.pdf?index=trueIn PDF document text
    • http://bavatesivo.myartsonline.com/48077961269.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_92642269cbdf4e6e99631ac72ada6357.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13796a2d-1a90-48e7-9073-f17b6a32cf28/john_deere_430_snowblower_attachment_for_sale.pdfIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_c89d8c76abd7462ea70ba86cbac93228.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_ad64d6382663442c829e113baf4bd9e7.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_9d13a8abbbe0486294d8005059f322f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63fb0e45-5238-43d1-8002-183d003566be/lenovo_g50-45_80e3.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/who_is_the_god_of_protection.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_26f3176b5a054f86aed836ba24114918.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 5576 bytes
SHA-256: 5256808e469f5e87ad01d67e19d43628a8756c56a3a046ec8728a346047e3df0
font_02_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 10788 bytes
SHA-256: e7091fe790eb62c763d344ec89ce79ba04cdcef7fb9ea6adcad42633b2d178f8
font_03_sfnt_off00013319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13319 16132 bytes
SHA-256: dffdd32b9c290446653620a54c5d872f7eec68ecee48cb503e5cfcfec63ed28f

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