Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b07303c9c3b22e…

MALICIOUS

PDF

79.3 KB Created: 2021-03-30 19:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f176b88b140261e7bca1929de868ef77 SHA-1: 14fc3cd903a640f66ef9310e0557c2d1ed814c5b SHA-256: c1b07303c9c3b22ec2ae4fe7996c62fa4cc3a6fa398486233734969fefebaa42
186 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=bifie+mathematik+aufgaben PDF link annotation
    • https://cdn.sqhk.co/nosimasiv/hhb1Tzy/ping_pong_ball_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/8rRjcig/dragon_ball_super_broly_wallpaper_4k_pc.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/sarav_tawogekuvakiwux_fepur.pdfIn PDF document text
    • https://vewefididijos.weebly.com/uploads/1/3/4/5/134517371/9294413.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/Is6iihb/warship_craft_aircraft_carrier_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/ij8G8TO/33429755541.pdfIn PDF document text
    • https://cdn.sqhk.co/kesumixom/fwhiZQB/sos_emergency_ration_lazada.pdfIn PDF document text
    • https://dedejabo.weebly.com/uploads/1/3/4/8/134875177/7689326.pdfIn PDF document text
    • https://vetebifarex.weebly.com/uploads/1/3/4/0/134016991/5324410.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdfIn PDF document text
    • https://pulapafux.weebly.com/uploads/1/3/0/8/130874232/1147822.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/fd3806d6-dc09-4d60-bcff-01abdca1c5bd/simiwemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b66490-7ed0-4893-8039-42a4cd293683/define_law_by_different_scholars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddd7caf-ecb8-4295-9a94-cc70b4342e27/pride_and_prejudice_mr_darcy_castle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6125deeb-4da3-47b6-be6b-772acadc62fa/lemapinogamipaz.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/96433928610.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/zewoji.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_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 5128 bytes
SHA-256: b2d17360e06730fb9ecef609283fe85da01dbeafdb1e1489a02a903dc973e83e
font_01_sfnt_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 11480 bytes
SHA-256: 4258e351f871625ea1276af768630579f391f3fd4c5f793c62a05baaaf6779b6
font_02_sfnt_off000118a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 16344 bytes
SHA-256: 86a97140751964500b891ef459622698110eb838039e176ad0f360275e68e9e7

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