Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca86bf9efddc54c…

MALICIOUS

PDF

78.4 KB Created: 2021-04-19 05:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05c71394eadc6b8f64234f6325590b89 SHA-1: b4d210d68d64b1569899758db9bfed714bbcb5be SHA-256: aca86bf9efddc54c34c497ab221e685ab4fbe900ec1673bb39b28c833331a60f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one primary URL is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a tactic to obscure malicious intent or distribute traffic. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=bobo+doll+experiment+results
    • https://netajeripen.weebly.com/uploads/1/3/6/0/136053717/b1b1713162.pdf
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/kanobuk.pdf
    • https://cdn.sqhk.co/nevupediwix/8NgffAu/nugikakatovoxowimatugofij.pdf
    • https://cdn.sqhk.co/ruxukulalodi/ejggjhc/41936507993.pdf
    • http://nowemuzasam.22web.org/1_kn_m3_to_lb_ft3.pdf
    • http://majidadap.22web.org/l_equip_fruit_leather_sheets.pdf
    • https://cdn.sqhk.co/bijozugetav/jihggsZ/lotuv.pdf
    • https://cdn.sqhk.co/wexunabem/haLifhi/24281663526.pdf
    • https://dovomarolod.weebly.com/uploads/1/3/0/9/130969455/zefof_berexarevosirum_doguwazafajoma_bovobugep.pdf
    • https://cdn.sqhk.co/karapenakozi/KYlVDjj/ximuzej.pdf
    • https://vozapevozatoka.weebly.com/uploads/1/3/4/0/134097066/1237188.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_3870d2de5175446285e469825de65bf5.pdf?index=true
    • https://s3.amazonaws.com/xukanomarexumu/zevegelitemifi.pdf
    • https://s3.amazonaws.com/gurupixabogivaz/machine_learning_algorithms_complete_list.pdf
    • https://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_904c37617d294958a869a826d3a49b05.pdf?index=true
    • https://s3.amazonaws.com/dudujopixejikug/8d_corrective_action_report_sample.pdf
    • http://zatozisuxaxabiw.rf.gd/77516168128.pdf
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_12c6b016b3204156ba2f732491501399.pdf?index=true
    • http://labilugukaj.rf.gd/pain_three_days_grace_lyrics_meaning.pdf
    • http://turegipamikum.epizy.com/gewizutiferuroduzudowofez.pdf
    • https://s3.amazonaws.com/dofufiri/form_score_sheet_basket_perbasi.pdf
    • https://s3.amazonaws.com/forupokisip/66313314122.pdf
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_f58ed937ebe3482ea725e141201c04cd.pdf?index=true
    • 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_off0000e8ac.bin
dfeff4472f8d12fc8f4b90e2364777ef059c51c55d4c9c38510bf337482731a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 5032 bytes
font_01_sfnt_off0000f9af.bin
d3d46bf15b1041239041d6e60e2d57ac77e0e11f817d2d1f12149777af6076d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10620 bytes
font_02_sfnt_off00011e0e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 4324 bytes

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