Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd288bf8ac95c35…

MALICIOUS

PDF

98.8 KB Created: 2021-04-15 22:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a61a98dddd1b8731fa24d46d4238e571 SHA-1: 99ae0494681c86f8c179352555a29d716feea84d SHA-256: ecd288bf8ac95c356cc8e1b0c9c5a4fe7048b5737968ce3d32a2b3888e8bea7b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of embedded external links, suggesting it's part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The presence of a URL with a 'utm_term' parameter further supports the idea of a targeted lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=what+are+signal+words+in+text+structure PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374533/normal_6005e6fc7b8aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_6029c95764fc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491426/normal_5fedc4c369c35.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/95126856595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_60034910a2f92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_a3fceea5dd7143e298e5e88a38e7b102.pdf?index=trueIn PDF document text
    • https://aab3b5a3-3501-4647-bf8d-17d8175ff737.filesusr.com/ugd/87b9a8_cf4883b47bbf4ca6aa386d4022737acb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fezenur/sankarabharanam_movie_naa_songs.pdfIn PDF document text
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_c2eca1fb261a4bd7b81d4fe46872e5f2.pdf?index=trueIn PDF document text
    • http://vefelazubogimew.rf.gd/hp_8625_printer_ink.pdfIn PDF document text
    • http://sigivopowofode.epizy.com/voguleguwibavaxo.pdfIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_49b2aa7717dc4fd581d6eb4408d5e5ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/subject_and_predicate_worksheets_second_grade.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_10632d18558146d9a5499754202290cf.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_62752ac50d1e44fda0402e52cf5d0dd8.pdf?index=trueIn PDF document text
    • http://nivuzujanux.myartsonline.com/movenewolafotaxemudafiku.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/black_ice_cream_flavours.pdfIn PDF document text
    • http://gawisibo.rf.gd/administrao_estratgica_michael_hitt.pdfIn PDF document text
    • http://gejijudufer.epizy.com/the_crown_season_2_episode_6.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_off00014128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14128 5376 bytes
SHA-256: a71d5a23f6c63e3703bf8c1416032319d6f35555576fbe3c7578719f338d11c6
font_01_sfnt_off00015386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15386 12280 bytes
SHA-256: 641fa5c38b502f5cad2da7957bf9b6b46aeef12709c934f94f00ddfa5df62cec

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