Malicious PDF — malware analysis report

Static analysis result for SHA-256 0850ee51ed961d6a…

MALICIOUS

PDF

90.0 KB Created: 2020-11-13 05:38:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 94d1023a442f06c0f98bd89e0c4c4b4b SHA-1: 735dc7402be46912b865d98ce9d0f217f44fd66c SHA-256: 0850ee51ed961d6a50aedda2cfebf19dff33b8feb2aca82b568badba288fc810
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm and an embedded URL pointing to a suspicious domain. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to educational materials, directing users to a URL that likely hosts a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?utm_term=bihar+tet+computer+science+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475383/normal_5fa5b7b03b4e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5f8d73c0ac7bf.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/buwafudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f8769cfa3be4.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/d7c643e8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d7256c-9dca-4e2f-8fca-10ba862792f1/kopitoronig.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/57696477011.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/16399860426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09fb84e-76fd-4971-a10d-0fafe476df71/mersman_furniture_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb721cc2-5958-4d3e-b97a-c779d7d55e0a/73937886956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6752ff-5de2-4578-88a9-9506b0f5444b/wonojokevinigelixozisodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55846e17-66d0-4516-a89f-cba451423762/american_cinema_american_culture_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b916eaf3-25a5-4008-8095-ee97eab9177e/fight_club_movie_script.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 5616 bytes
SHA-256: ecb83abdb84d8a328da95d40b4acdd6c851ac4a2dccfcbcae75cda3d9a1b1e0d
font_01_sfnt_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 2600 bytes
SHA-256: 2391df7b92e21d562156c3fd458f3ff956ca72732b4fbf1295a263024f3464b2
font_03_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 11576 bytes
SHA-256: 62bd647d03f1649704e3924fb72a0b5c3d2f0f79687411a36501dcd79c1a85ba
font_04_sfnt_off00012083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12083 16276 bytes
SHA-256: 4234460f63c82a422405b6326cfeac4a3c31d97a5c9773b996b2eb3ffa0ba3d8
font_05_sfnt_off00013655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13655 11692 bytes
SHA-256: 21dd87df7f2b1e961702a4c9af1f765e8d0f44bf057d64113d5f95ce9f17356f

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