Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4381d1c4691bcc0…

MALICIOUS

PDF

71.6 KB Created: 2021-02-27 20:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2a3d7dc438bd32d55c50124fa00294fe SHA-1: c378e97c6c021a62eeae99249e258ffd77dc2deb SHA-256: f4381d1c4691bcc0f68c4b567d4c3602df44cf7d5b2b02cea0379e86d07ed71c
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 PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a mass external PDF link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=setting+up+a+dcs-930l PDF link annotation
    • https://tonilawug.weebly.com/uploads/1/3/4/6/134652309/minobejideletuw-lebinamanipuj-gavegoroxetefa.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/nuredumaxusenuj.pdfIn PDF document text
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/5721803.pdfIn PDF document text
    • http://hamsterbig.com/living_flesh_door_grim_dawnbv1ei.pdfIn PDF document text
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/nejug.pdfIn PDF document text
    • http://instapriz.site/nebijirevurapefi3suza.pdfIn PDF document text
    • http://pinudub.iblogger.org/grand_summoners_apk.pdfIn PDF document text
    • https://dovavifedudefew.weebly.com/uploads/1/3/2/7/132710721/f14a4c22.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/57197424447.pdfIn PDF document text
    • https://lixemuvoxowogod.weebly.com/uploads/1/3/4/8/134878154/7092f94444627.pdfIn PDF document text
    • http:///image.jpgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mudurixo/formation_autodidacte_informatique.pdfIn PDF document text
    • http://vexelikepe.epizy.com/naija_afrobeat_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/fantasy_basketball_beersheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/kokuvuxijodabagowapiwise.pdfIn PDF document text
    • http://kafudunafow.epizy.com/30892783978.pdfIn PDF document text
    • http://widifusi.myartsonline.com/lets_talk_in_english_conversation_16.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/he_went_to_heaven_in_a_whirlwind.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/31788888007.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/w3layouts_free_html_templates.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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 5740 bytes
SHA-256: b9791f73eae2cb9c3f4e119bbda0347ae8c1893a87ba51623facc0386cb5f0ba
font_01_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 10580 bytes
SHA-256: 96ce80520ab4ff619f1cc1dcab291aa329874fd3dca2a1935c31c8c7bc094fab

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