Malicious PDF — malware analysis report

Static analysis result for SHA-256 74cd1b1ca56a67ce…

MALICIOUS

PDF

78.0 KB Created: 2021-01-25 19:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 51c604c0e5eb0ac3bea1337c491cd01b SHA-1: c8ea3e9653e617398df5d1b0d2ae7ca7b8369ef6 SHA-256: 74cd1b1ca56a67cec61ee0f8e0cf890487d3da9f3f8bf6fc54db6dac78ac0975
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic suggests the document's primary purpose is to redirect users to numerous external PDF files hosted across various domains. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=interview+with+a+cannibal+vice+youtube PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498971/normal_5feb0a8ee4f0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378165/normal_5ffe012214616.pdfIn PDF document text
    • https://cdn.sqhk.co/jagavibejabe/ciehf6a/78757973368.pdfIn PDF document text
    • http://futup.ru/thrifty_car_rental_airport_locationizsmc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fd8af272542b.pdfIn PDF document text
    • https://zivotawab.weebly.com/uploads/1/3/4/5/134576919/pojitigatekaxi-dobenif-pabosit-wezapasijuxux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459185/normal_5ff9b16741ea2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374957/normal_5fe2f7f66a58c.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/4k47yHj/tevuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_600bd4ead574e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381536/normal_5ffd10996394e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497081/normal_5fc93dffa787d.pdfIn PDF document text
    • http://subfamjtii.site/aafes_fort_hood_jobs5s4gh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387932/normal_5ff151ff6b4e7.pdfIn PDF document text
    • http://xbet1.fun/xukosevanuvutojoxulapfjouh.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/fHkVpjt/12564403286.pdfIn PDF document text
    • http://hookup154.online/swepco_lake_gentry_arkansasjl261.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/QFVThbL/leopard_robot_game_mega_robot_bike_games_unblocked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 5504 bytes
SHA-256: 173f2359088359c307d8673721cb0aaeaa7f56fa1b76c824ee2b505dd9cc5dc0
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 5040 bytes
SHA-256: 90339b85d7821d7961464bec9c532254b38c976fa1c1448017206bb219613c60
font_02_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 10704 bytes
SHA-256: 060f54469c2d08d2023413180fdf13a66692c7d12974b20831de25b0f7912d7f

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