Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eac8de2935e7ae9…

MALICIOUS

PDF

80.9 KB Created: 2021-05-28 06:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 064ce310551e6320108877a0cc0dedc8 SHA-1: c9e0fdcb61364a2af76588e50a377643a9fd6b0d SHA-256: 8eac8de2935e7ae91c6a3d36bb6f99637be02014b5d89c4c1618c3f14ada6af8
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/123?utm_term=esv+bible+offline+free PDF link annotation
    • https://pobikutilun.weebly.com/uploads/1/3/4/8/134871216/vorejutapin_jokiwazajalido_jofaxebap.pdfIn PDF document text
    • https://bidubemawekewar.weebly.com/uploads/1/3/0/8/130815124/aa7775a1225.pdfIn PDF document text
    • https://telutowi.weebly.com/uploads/1/3/4/9/134904764/b561cc5c84.pdfIn PDF document text
    • https://musokolej.weebly.com/uploads/1/3/1/3/131383826/5f6e17bb05fe68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_603845f4716b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_5fdba74beec9a.pdfIn PDF document text
    • https://bisifivu.weebly.com/uploads/1/3/4/7/134724717/juwojinijezimemizi.pdfIn PDF document text
    • https://duzajitoji.weebly.com/uploads/1/3/2/6/132680922/9831263.pdfIn PDF document text
    • https://doliwalesi.weebly.com/uploads/1/3/0/7/130776147/bomukojovexobir-gudokuxibix-banelafaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_5fe8806bb2555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501509/normal_606b817e2cbb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448549/normal_5fe12aeecfa10.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/gefodib-pivog-logige-fajisodovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_602e36f71bf9d.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/08c94a16-53dc-48df-be1b-712375d43147/kejaweguzutoxej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db8c66b1-124c-4a84-925e-cd4aba397cf3/what_questions_are_asked_in_a_police_interview_polygraph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d089b3-e25f-40d1-9908-47d8fcfa466d/durobijutamifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c014a67-f6a2-4068-a984-e5062b0da033/xufupekadanib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b47487ed-4e3a-4a59-808f-5593826e51ac/sapat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77661389-3020-4c8e-a4bd-05545a9fb82d/12628047143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541c518b-3764-4a26-b84c-1e0751a0cd9f/what_charities_has_nike_donated_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973185e2-82a8-49dc-a2ae-7f27b942eaa9/how_to_share_a_chart_on_thinkorswim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f28746-da82-4c88-a5bc-a7e007b8de3d/lelejusitibovugivixoradem.pdfIn 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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 4708 bytes
SHA-256: 95c42c0981f61e1452a5413156cd76e523b81e1961b45a6ebfa33b6ee7f5d1ad
font_01_sfnt_off0000fb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9A 10852 bytes
SHA-256: 6917d3c396c27b243a64325de2627ed2715fbf25b858f1a3064dcc4b7d588b75
font_02_sfnt_off00012117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2