Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39b4b2117ee5b7f…

MALICIOUS

PDF

61.8 KB Created: 2020-12-23 23:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 43125347e8ef3a14618de172f3e016d3 SHA-1: 98742a96ed252647dbeb2b13b50d717244eaf54c SHA-256: c39b4b2117ee5b7f3a52f0cd399adc31d2cd3ee29301f4b3c94040d73d1b0312
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=shimadzu+gc-2014+user%2527s+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454965/normal_5fd31489381a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5f9eea696c449.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/db012.pdfIn PDF document text
    • https://zetoruribafepa.weebly.com/uploads/1/3/1/4/131452904/gamejaka-folipom-vepavomala.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/3ee60366-5b69-4ea3-94a7-e1eabe904eaa/zupivexorepokedevudemaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02d324b3-a24e-48fd-ae98-d644f2ba42ac/42625272233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bebcd67f-1a4a-4414-a087-860427544594/whatsapp_android_apk_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c41d4e-d13f-48da-8440-d177bc9132b4/wisesoxafizaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d79d403-3adb-4f4a-b8cb-35915fadcfe3/aa_daily_moral_inventory_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b4f13b7-e825-4637-b695-c683e43e6e60/56079356234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79fe3c4e-d6bb-4b7d-8d4f-f3c1ff7c3c76/xepajifatetolofof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89538b5-8c69-468b-a8b5-2681fec0dc18/24867129894.pdfIn PDF document text
    • https://s3.amazonaws.com/gebaxovudofe/what_is_a_clear_credential_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68dbc35b-ad56-4431-91cd-ba5d15288a75/hatchet_chapter_12_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/gijex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758dd7de-3816-4f0a-a5c2-5519ce1b6b84/gorudenojopepamolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a26d43c-e908-43d5-aa21-d8ec303d6dbb/tunob.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A7 5988 bytes
SHA-256: 8b935e01d7d46cf1560f48d2abe068204d464488be4e761e7f194f219e5d6fc7
font_01_sfnt_off0000caf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF7 9044 bytes
SHA-256: d2f3fb1037e0cb7293f1406fcd8666c8caa48a5a177fd6762bb062467cb8c3e4

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