Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3d06eaab9f907f…

MALICIOUS

PDF

101.5 KB Created: 2021-03-13 14:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3dab819529a449320fc585de8953cb21 SHA-1: d1c1aeeba2dac87db21cf49068275770eb5194ee SHA-256: dc3d06eaab9f907f13cd4e683636800fd5f905e08bf1a7c84939515f700d9c02
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or trojan activity. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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 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://druttle.ru/aws?utm_term=how+do+i+know+if+something+is+wrong+while+pregnant PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410447/normal_5ffc4cbd0d2c5.pdfIn PDF document text
    • http://easterthjg.com/whirlpool_washer_wtw5000dw_service_manualvufnj.pdfIn PDF document text
    • http://gaydating.world/lenoxegat1hxt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_601ae05f96b0e.pdfIn PDF document text
    • http://jobware.pro/jakaxavamadokivenebuvuwodj81p9.pdfIn PDF document text
    • http://cabinetsop.xyz/no_game_no_life_season_2neyik.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/gf7qieC/17296396567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_6036692ee845a.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/etgd6k1/demakelitonixe.pdfIn PDF document text
    • https://cdn.sqhk.co/gupimupiset/3Njcy8n/wifi_hotspot_software_windows_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/gcEhhgB/laxugapikiwew.pdfIn PDF document text
    • http://biggymstoe.com/103849748390jd7k.pdfIn PDF document text
    • http://barashik.space/chapter_5_test_form_g_geometry_answersz3bsz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490244/normal_602c1e73b44e4.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/PhaPQhj/game_maker_online_free_3d.pdfIn PDF document text
    • http://olx-delivery.cc/face_changer_for_pc_online8sm0o.pdfIn PDF document text
    • http://wide-take.top/nomobezaravorr64es.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_cf59a132bc92406994e530567d054b67.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_b22f72f8088e4735b540298f3a588d2a.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_54c9f1de077740579013a977d05d5f4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56984a47-02ed-4fc4-9add-65bc6fb5d0d0/74852109884.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_a8ef237d30dc47ef844bb5f9c5e83e91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5672264-38e0-47ea-a43e-cc7acb2dedae/60018474817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95903188-ede6-4968-b91a-94ea1db32b0e/rumikafivubub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c673e00d-d022-44d2-8831-f31bff444c34/how_to_use_training_shock_collar.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_6f353447a97e466483338199d4edf448.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/524f1e41-a574-4e57-b5ea-1ebf2c5bb849/list_of_iatf_certified_companies_in_india.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_off00015037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15037 5572 bytes
SHA-256: 400e93a74b66eb0fcf009e45148099d43daceef71f65675e8d446fbf5e6dcefb
font_01_sfnt_off00016315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16315 10672 bytes
SHA-256: c578c975feff72118a7f8331a3fdcdbc99a32bef2d300091bfa52b0a317b2034