Malicious PDF — malware analysis report

Static analysis result for SHA-256 76cee482c291e0b3…

MALICIOUS

PDF

112.5 KB Created: 2021-04-12 15:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7be04ba326e66fca389fe6a50e05cef2 SHA-1: 7a0c8d88e2694001656ae3a55504b2f6bbbd5548 SHA-256: 76cee482c291e0b3c6be7f8c5c29161649d8d1a4eb282714e470a671dbab01d4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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 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/strik?utm_term=does+the+us+postal+service+deliver+internationally
    • https://melijavunibujov.weebly.com/uploads/1/3/0/8/130873932/zozenavunavuza.pdf
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/5791118.pdf
    • https://xogovowumo.weebly.com/uploads/1/3/0/7/130738979/tupifixomijuges-latokiliwowi-bosivowafura-sazaxavuxodab.pdf
    • https://cdn.sqhk.co/sadetujadufi/Fieggje/mikibisigobema.pdf
    • https://xufudigu.weebly.com/uploads/1/3/4/5/134515134/2d33e8a45.pdf
    • http://kilunanaged.iblogger.org/does_apple_tv_hd_have_hbo_max.pdf
    • https://xuxijoma.weebly.com/uploads/1/3/3/9/133997678/vujoz_wumulufapudap_warulemazij_mariz.pdf
    • https://patekakedosejot.weebly.com/uploads/1/3/4/4/134479085/43deb32dc33b.pdf
    • https://lafofawevomu.weebly.com/uploads/1/3/4/7/134770087/tigigakaxedubev-nufuwano-nowafikenezova-latuge.pdf
    • https://zoparimunafixi.weebly.com/uploads/1/3/4/3/134336740/1132957.pdf
    • https://cdn.sqhk.co/xiroxozalal/djLjfhi/7328298474.pdf
    • https://duxobibalarig.weebly.com/uploads/1/3/4/3/134360367/d1238be5935fb9.pdf
    • https://cdn.sqhk.co/kulobibab/hKsL1hh/mewetuvezipebasavid.pdf
    • https://fubewewafipox.weebly.com/uploads/1/3/0/8/130874235/35db7cb1ff010.pdf
    • https://xasevezivim.weebly.com/uploads/1/3/5/3/135302984/a83d5963575867.pdf
    • https://cdn.sqhk.co/dewufidabo/wAifTcd/electrical_testing_symbols.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kalijumixu.epizy.com/juvubitilarodo.pdf
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_9a3c1450a5a24d71ae191a98bb748847.pdf?index=true
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_2f140155b69d42f78b40f206884653d4.pdf?index=true
    • https://a1104102-e7f7-498f-9db5-fd16eb5a1c84.filesusr.com/ugd/3f19aa_1b792e4d788c40a5b87cf63cb1a0d3c5.pdf?index=true
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_9344b52c2e174f69b39953022b9dd667.pdf?index=true
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_4b60b2c980f94c61a078285359e875b1.pdf?index=true
    • http://burupilejeg.epizy.com/90682187978.pdf
    • http://monufaro.epizy.com/study_bible_macarthur.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a02.bin
a4f23bdea4789a5733b9b68a17389ec597bd6aa741effa7f0e369c3759545695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A02 5324 bytes
font_01_sfnt_off00018c2a.bin
616f07527bd5cfaa5a963bee6b0007e672279d7310eff0f984aab6959f715c64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18C2A 11772 bytes

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