Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a345a0eeb04affa…

MALICIOUS

PDF

75.2 KB Created: 2021-06-02 10:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1266ab31b18a7ca52fd874f6de1fe89c SHA-1: 376ce1e4344a01ad15618a3ef01ec6961b1490b5 SHA-256: 6a345a0eeb04affa5597fe3f5478c705cb997603d099ee42422b0f0fa8239baa
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. 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 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://laborke.ru/pbw?utm_term=windows+10+airpod+case+driver+error PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382003/normal_5fc6b98ca420d.pdfIn PDF document text
    • https://basipavegisu.weebly.com/uploads/1/3/4/3/134390368/kemupida-kuxogobewis-riwopaf-lizedopisejop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475874/normal_605c5e3ca041a.pdfIn PDF document text
    • https://bugajikiwolano.weebly.com/uploads/1/3/4/4/134471946/wowar.pdfIn PDF document text
    • https://tosofovopige.weebly.com/uploads/1/3/3/9/133998067/sozozebekakenubakupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5fd0a49e69566.pdfIn PDF document text
    • https://metuzozimo.weebly.com/uploads/1/3/4/5/134589213/2620919.pdfIn PDF document text
    • https://jowidirususonin.weebly.com/uploads/1/3/0/7/130775515/zokubuzuxok.pdfIn PDF document text
    • https://tinofapilasi.weebly.com/uploads/1/3/4/5/134518201/pobufek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5fed7eb2c50ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456377/normal_602ade74daec6.pdfIn PDF document text
    • https://telutowi.weebly.com/uploads/1/3/4/9/134904764/zevuke.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/c1cba1ef-6d37-461e-966a-6cb24736783b/kefilibibamitad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a7eb1ab-ecbf-4bf6-99c4-6c1d49534832/how_to_remove_a_badger_1_garbage_disposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9440e9bb-ded6-4c1f-afe0-3df12289bfeb/19552778343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f73a237-13ff-4fcc-8a69-1bda73068215/darapowonikorejupanisuzam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab921039-862e-4668-b74d-2b6b5e382cc1/how_to_reset_bose_wave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b521d927-7529-4d6b-bd6c-20b6816e1734/listening_comprehension_passages_with_questions_for_grade_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/517caaec-d84c-4a77-ae8e-5b8dc810edf1/trig_identities_worksheet_grade_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a53d8c8-ce5a-4790-8f6b-500ff44061fc/prisoner_b-3087_audiobook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73cd484-4623-4b9c-be53-1e8ff6f52a42/92133789708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/089f2cc7-532a-435d-adc0-9e236cf31e0d/how_to_get_playstation_card_for_free.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_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 5396 bytes
SHA-256: ac0360403c1eadf2d6a9392e8402310afe3058bc54f4630a312ce03c3df4ce93
font_01_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 10996 bytes
SHA-256: 27283354f06971d21100b8beb5e9219ea735127a6fd61e582ebe4b8249c7e9f8