Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9c991f12d4f554…

MALICIOUS

PDF

73.9 KB Created: 2021-06-01 21:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8410ab7109b1ab5ce33d4a23c223bcca SHA-1: ed0f2e9a75238f7df3ae542a96db7e288fff9fce SHA-256: 1e9c991f12d4f554609f9f2b917d655bd927e06f0000378fb4fed0abf6570148
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URIs, with a primary URL pointing to 'infrive.ru'. The document body is heavily obfuscated, but the presence of multiple external links suggests an attempt to manipulate search engine results or redirect users to potentially malicious sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of phishing or SEO spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://infrive.ru/pbw?utm_term=market+leader+intermediate+3rd+edition+workbook+answer+key PDF link annotation
    • https://tujarabevazedi.weebly.com/uploads/1/3/4/2/134235746/7b164c6cb2ab.pdfIn PDF document text
    • https://gituruledutaza.weebly.com/uploads/1/3/4/4/134401886/rudevelemu-modebi-vijakese.pdfIn PDF document text
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/xibixan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_5fd7dad248728.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367640/normal_5fef55e4812ad.pdfIn PDF document text
    • https://lazevipabeba.weebly.com/uploads/1/3/4/7/134712462/8499990.pdfIn PDF document text
    • https://dewosuto.weebly.com/uploads/1/3/1/4/131453399/verakirim-tosamur-gijetigibomu.pdfIn PDF document text
    • https://namerodedisa.weebly.com/uploads/1/3/4/7/134771167/tamejidawem.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/19d0fce6-55ce-4bfd-9601-67d320da2884/todas_las_medidas_de_la_cancha_del_voleibol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b781ebdf-7960-4388-8b58-6c408e91504b/61685357677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052fb73b-d18f-42e4-b8eb-09d569a09c4b/how_to_fix_howard_miller_grandfather_clock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1d8cc83-b295-4725-9f5b-f541eee8a427/8422680518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25735f7f-4cbf-40dc-aacf-85d3efcdfc57/100_verbos_en_ingles_y_espaol_en_pasado_presente_y_futuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3464f122-0141-4a36-a56d-254105165413/what_is_born_haber_cycle_in_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c937bc0b-4417-4b48-94a6-69d02b3f9f4d/why_does_my_harman_kardon_bluetooth_speaker_keep_turning_off.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_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 5536 bytes
SHA-256: f78e502abb08ee103eb287da3b04da825b9d9243cdb455a786892a61d6f9aa6f
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 11300 bytes
SHA-256: 4bcc08009c121e0aae5f09db32ba10a1f0f16b26cd816a097a5a463fad4b986f

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