Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6202945cdcda38…

MALICIOUS

PDF

91.8 KB Created: 2021-03-05 22:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e523422c6f041e6888cc60c7c7b0a6e0 SHA-1: ec575bfbe02ad49b58a0799abf35e89084e2dae8 SHA-256: 3b6202945cdcda386bdeb6aa0a4391f101cbe2c7d3e5d5187c2bc08501d51226
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 ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of numerous external URLs points towards a redirection or download mechanism. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/strik?utm_term=how+does+urea+diffuse PDF link annotation
    • https://zozolesib.weebly.com/uploads/1/3/4/6/134631165/9035600.pdfIn PDF document text
    • http://usesucre.pro/ripununeputodijanid9gt7t.pdfIn PDF document text
    • https://temevukovekolax.weebly.com/uploads/1/3/4/6/134688950/mewogoniso.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/wotoje_denisobini_verez_tadek.pdfIn PDF document text
    • http://afracheat3.xyz/adjective_clauses_with_quantifiers_exerciseswqzlb.pdfIn PDF document text
    • https://gisunotagalaros.weebly.com/uploads/1/3/2/3/132303086/pebukukimevin_gokukoxex_tefitifa.pdfIn PDF document text
    • http://grusha.space/ejemplos_de_suma_y_resta_de_polinomios_resueltosv9j9m.pdfIn PDF document text
    • http://getporte.xyz/pafolij9e7z3.pdfIn PDF document text
    • https://xobawaxotax.weebly.com/uploads/1/3/1/4/131453143/kopodox-larawawid-waretesexun-bevawo.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/hbEqiiZ/top_wallpapers_parkour.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/d9ijjiN/39431680981.pdfIn PDF document text
    • https://maxamiboxu.weebly.com/uploads/1/3/1/6/131607029/6457833.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/440129.pdfIn PDF document text
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/d3627a9a00.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvotalek/VKs1K0b/sofezegu.pdfIn PDF document text
    • https://cdn.sqhk.co/xosuridasago/hcjfVgg/viral_sport_tv_apk_for_pc.pdfIn PDF document text
    • https://wejafivikime.weebly.com/uploads/1/3/0/9/130969279/zedubipexasazow-bifugininix-juxefovaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeacf3e5-d1c4-40fb-80bc-586819ef8f61/lajiwusavavobeb.pdfIn PDF document text
    • http://sixusugiw.rf.gd/94289831276.pdfIn PDF document text
    • http://pusukobu.epizy.com/43012932695.pdfIn PDF document text
    • http://lokuvutifinulef.rf.gd/28889454215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39586a75-a71b-4045-bd5f-2711a701b820/is_taking_an_sat_prep_class_worth_it.pdfIn PDF document text
    • http://dumatefofexulen.epizy.com/dulakinorafebubok.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_off00012a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 4924 bytes
SHA-256: e62b69c0f3044f33ba17beec02a613c8f2955edd35bf67b164b4abcd2f5ef64e
font_01_sfnt_off00013b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4B 11244 bytes
SHA-256: 091cabe373b3c9fe5ecec605199a88761608615faea8edb6621bf91548ca3eb5