Malicious PDF — malware analysis report

Static analysis result for SHA-256 257de49f3631743f…

MALICIOUS

PDF

86.5 KB Created: 2021-03-08 13:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 53f8ea7c23f1dfdaf63be53dd4328f12 SHA-1: f31dd77bb0ac084b781d36678a12161f41569a52 SHA-256: 257de49f3631743fb2dfbfd910faef198b27ed7caa68e17bdcd01dfb68e8984f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs, likely to manipulate search engine results or redirect users to malicious sites. The presence of many external links on disposable hosting suggests a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/award?keyword=economic+botany+notes+pdf PDF link annotation
    • https://puxinatax.weebly.com/uploads/1/3/5/2/135295704/wakesikanit.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/943315.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/fufolewifexag.pdfIn PDF document text
    • https://xovixonu.weebly.com/uploads/1/3/4/8/134896571/a78df18c0.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/cjigchi/rorigurul.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/7b3434a920ec5f.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/kenmore_washing_machine_motor_coupling_repair.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/wojuwejabesexiwukig.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/iMhdgd1/games_similar_to_warlords_call_to_arms.pdfIn PDF document text
    • http://dejivuxa.mygamesonline.org/rozojimukuzogebusixeked.pdfIn PDF document text
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/sododubu.pdfIn PDF document text
    • https://tugagofinose.weebly.com/uploads/1/3/0/8/130874012/3ec57bc1ea.pdfIn PDF document text
    • http://lulilafemavivog.mygamesonline.org/que_es_un_autorretrato_en_el_arte.pdfIn PDF document text
    • https://sujezebaxoxil.weebly.com/uploads/1/3/4/3/134316131/889718.pdfIn PDF document text
    • https://cdn.sqhk.co/nikapeke/hfwXhiJ/mepeb.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/00a1ff3d-4d04-48ba-aea6-f82cc3c16340/place_value_worksheets_for_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f14ac80-4a80-45c9-8000-6f8f72ca1a92/luruvubafu.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_f7330c6df1bc4195a5438f855da2d9c4.pdf?index=trueIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_a02fcf63f19447c2bbabbe9758e3cc64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e79632b-ec8d-4932-a816-1eb840da6c40/63383476367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d12023-2b2f-423c-9568-52b10c728207/vezukotafakanexorezek.pdfIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_b0549b67ae6e43009fc14be0afe8b581.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_a9efbb398b5d42b9a9fea4dd766bffe1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bbe5ab5-ccf9-4359-bda7-1f766f6afcfe/english_grammar_worksheets_for_grade_5_with_answers.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_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 5372 bytes
SHA-256: f9483795a41481a356728ac2d8ffbe33d613069e7950a593d9e14ff2c222ffbe
font_01_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 10732 bytes
SHA-256: ff3a51b8a99ab1cf01284d35f17934d8b37ded6179d7ead7ab2f3a8feb9a0f90

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