Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a87250d35286d0e…

MALICIOUS

PDF

93.9 KB Created: 2021-04-10 10:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7df119d756f23da8c6e498389b3ae8d9 SHA-1: 31b6309802aae470c2d1c8adf122fdad970991c2 SHA-256: 2a87250d35286d0ee064f3b282cd57a174889838bca2bbf9c7aa79c3cfdd8b92
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document's primary function appears to be acting as a lure to drive traffic to these external sites.

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://zajinet.ru/strik?utm_term=images+of+organization+chapter+5+summary
    • https://gufogejerujog.weebly.com/uploads/1/3/1/4/131406717/0778d2a8622.pdf
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/jixugalabunigusud.pdf
    • http://pugisapi.mypressonline.com/40615739599.pdf
    • http://jigapenufi.medianewsonline.com/viroril.pdf
    • https://gipimosikiji.weebly.com/uploads/1/3/5/9/135963651/tamelosukalodu.pdf
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/xalipe-jonoterifogil-loreto.pdf
    • https://fugikoji.weebly.com/uploads/1/3/4/6/134611078/e43832311e93.pdf
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/vigigagopitop.pdf
    • https://pakoverixofe.weebly.com/uploads/1/3/4/7/134771358/wijetaxeduxed.pdf
    • https://mawikimame.weebly.com/uploads/1/3/4/2/134235565/bovobar_tapivot_soravufib.pdf
    • https://delosixopefo.weebly.com/uploads/1/3/4/3/134344482/wusifuzuzanarupom.pdf
    • https://rikafikisejale.weebly.com/uploads/1/3/0/7/130740062/diges.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e5eb2fa1-7429-4bdd-9f06-aebe1c13fe5a.filesusr.com/ugd/607883_a9cd5edd92a5422caa1a6eb3d1178bf9.pdf?index=true
    • https://s3.amazonaws.com/zasepo/kitchenaid_superba_water_filter_install.pdf
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_f90bcd06c75f4b5b9908789ba6460b12.pdf?index=true
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_ae6ad4f4a92a4455a7132e49faeb28d3.pdf?index=true
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_59c1f10817ac418798870a284810f51a.pdf?index=true
    • http://gavawekib.myartsonline.com/core_java_course_syllabus.pdf
    • https://s3.amazonaws.com/defujo/norma_coliformes_en_alimentos.pdf
    • https://s3.amazonaws.com/wupagivoz/exerpeutic_gold_heavy_duty_foldable_exercise_bike_with_400_lbs_weight.pdf
    • https://s3.amazonaws.com/banula/guvotutakilinineviva.pdf
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_23dcd751da5f4de989a05a700a41cedb.pdf?index=true
    • https://s3.amazonaws.com/jidosatikim/posisusibuxugajiger.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125a7.bin
c4d35dcf88cbf55220780ec5825dbff0f21bf301c293b82cba7d67a002edec41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 5492 bytes
font_01_sfnt_off0001383e.bin
a75292606042541ef00c5e5f1af936fe81a76bedbe1ef3fbd61bf3bd8b444e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1383E 10520 bytes
font_02_sfnt_off00015c2b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2B 4324 bytes

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