Malicious PDF — malware analysis report

Static analysis result for SHA-256 674773c05978f973…

MALICIOUS

PDF

77.6 KB Created: 2021-04-08 17:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 52fb19cda585c563cdb2dd4964267fd1 SHA-1: 444a44f2a60ae091735b690b151b8aea9f6d1e71 SHA-256: 674773c05978f9731d9c5d65d732cf0f0f24da9cd3f99f4d2253ed6d1ccf966c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://soxebez.ru/strik?utm_term=what+animal+is+the+most+populated PDF link annotation
    • https://cdn.sqhk.co/veludewozen/c30dgcb/free_back_pain_exercises_video.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5fcbd466454df.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/dggOHia/ragdoll_stickman_2.pdfIn PDF document text
    • https://cdn.sqhk.co/piwewupovo/AhfhhdU/91728744338.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikifefisu/as4Vrib/75906615125.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/basic_electronics_books.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/61eb097.pdfIn PDF document text
    • http://jotusimemirido.sportsontheweb.net/51833888626.pdfIn PDF document text
    • https://cdn.sqhk.co/buwozumu/tifU1tK/schleich-_42195_farm_world_playset_42195_multicolore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_6016d870405a8.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/chhhaT2/71441368344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_605f6e18968e8.pdfIn PDF document text
    • https://cdn.sqhk.co/nulojokine/igbgh5f/rujevozane.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/what_is_the_social_contract_theory_of_jean_jacques_rousseau.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450439/normal_5fe797ab0199c.pdfIn PDF document text
    • https://paludiwebi.weebly.com/uploads/1/3/4/0/134012690/2240488.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/jfVjjgc/guremap.pdfIn PDF document text
    • https://nebuvogafaw.weebly.com/uploads/1/3/4/5/134500745/rodisogun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_6014c1ede8336.pdfIn PDF document text
    • https://lezojefob.weebly.com/uploads/1/3/5/3/135319065/fananova.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/Sjbiguh/xuxeva.pdfIn PDF document text
    • https://xipowabiwakazo.weebly.com/uploads/1/3/4/6/134614187/862908651f.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/71745023692.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosevasejila.myartsonline.com/list_of_career_options_after_10th.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/bible_crossword_puzzles.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/coordinate_picture_graphing_easy.pdfIn PDF document text
    • http://bugazepoja.onlinewebshop.net/49703795512.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/19678748075.pdfIn PDF document text
    • http://fajazimigig.atwebpages.com/5034605975.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_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 5116 bytes
SHA-256: 170b5f849eb0266a5279adc495e6135bc983bb8711ded9d909e0065d4ed337ce
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 10320 bytes
SHA-256: 68ed8bae8f6ec07eeaa22ee40387b9c3bb594ca786fc38265aa905bc78a723c6