Malicious PDF — malware analysis report

Static analysis result for SHA-256 3087c1a73990363b…

MALICIOUS

PDF

75.9 KB Created: 2021-04-01 11:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cf70f139ccd0e4c3862bbb13e2098fd4 SHA-1: 5357964130211bf76ea6a0a4700ee9d69210a86b SHA-256: 3087c1a73990363b38bb3ddf88b91996b2ac0066ea36ea6ef86d36373e14673e
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests the primary purpose is to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=sun+dolphin+american+12%2527+jon+boat+review PDF link annotation
    • https://pexarokozisakim.weebly.com/uploads/1/3/5/3/135313666/wajebatawuxu-kovumetekena.pdfIn PDF document text
    • http://dezlice.ru/did_papa_johns_get_rid_of_pan_pizzaypci9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_60125245345ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472491/normal_605f914d487f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468836/normal_605f293896dd7.pdfIn PDF document text
    • https://visoruze.weebly.com/uploads/1/3/4/1/134109001/guxegapijuxig-koxuxonakoka.pdfIn PDF document text
    • https://jetesobamu.weebly.com/uploads/1/3/5/3/135323438/7450697.pdfIn PDF document text
    • https://megogira.weebly.com/uploads/1/3/4/5/134590171/7576820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_60461c5f78204.pdfIn PDF document text
    • http://help-business-media.com/14175934851m75k8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473031/normal_603f509a9a3c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461483/normal_606361428f333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5fd2d77f7b5b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_1898603c58e4494f9366c719e64c54cf.pdf?index=trueIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_6d21d159709c40d588bc3e568f18331d.pdf?index=trueIn PDF document text
    • http://lojojibuz.epizy.com/sazusure.pdfIn PDF document text
    • http://rejazimuperolik.rf.gd/xopojubifuvazevo.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_42ed0c4c214640b1a9079d017b5b1cf2.pdf?index=trueIn PDF document text
    • http://zevuketeno.rf.gd/scott_pilgrim_vs_the_world_game_ps4_online.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_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 5824 bytes
SHA-256: 4f457c4b60cdef7405b12bb25594b3385f8cc33f816afe2eca3fd3401bbdbac1
font_01_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 10368 bytes
SHA-256: 5cdfef4278fda4f6f64b4e60bdd639248414077380f44bf732717ea8112b5236

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