Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab377408b998535…

MALICIOUS

PDF

70.5 KB Created: 2021-02-18 14:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6848e42ed040add7e68a232eeba19344 SHA-1: 4446f85a56487e0607c04cc6d87d65ff5823e037 SHA-256: 1ab377408b99853588a1ed480531e3204802452c16686bed342d1099b7ba90b2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to disposable domains, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being flagged as a phishing trojan. The primary attack pattern involves directing users to external resources, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=the+house+on+mango+street+summary+litcharts PDF link annotation
    • http://citruss.space/fimosejulawikisesudasajijya0m.pdfIn PDF document text
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/fitadezepadi.pdfIn PDF document text
    • https://vipunufevewe.weebly.com/uploads/1/3/0/8/130874016/nizal_nixewa.pdfIn PDF document text
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/dunix.pdfIn PDF document text
    • http://pomirkapa.site/batzal_roof_designer_3ds_max_2014lu8ga.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/dadff0f04.pdfIn PDF document text
    • https://zagiwesojuju.weebly.com/uploads/1/3/2/7/132712322/jijozuzozasen_xujorijifula_kobujugowumubi.pdfIn PDF document text
    • https://cdn.sqhk.co/bepesewutu/jy7kij1/lezisofagikanumid.pdfIn PDF document text
    • https://fusufuxono.weebly.com/uploads/1/3/1/6/131606103/7561968.pdfIn PDF document text
    • http://bluhgang.best/411255612439daqy.pdfIn PDF document text
    • http://pagebake.com/basketball_stars_hack_2019_iosn3gy1.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/volekurefi_gevugipap.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/AieTrCJ/46827486869.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/jbidjc9/coloring_by_numbers_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sudimomovaw.epizy.com/46757606264.pdfIn PDF document text
    • http://vekubuj.rf.gd/duriduvewumelewoxu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEF 5148 bytes
SHA-256: c16e4658e7abde6e39d6870ee8d8e20d4c1427890f34f31cce458988092b6d09
font_01_sfnt_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 9812 bytes
SHA-256: f5a24616237ad375394bfe046dc6da53b87f6c35c97f47ecb4019bef35fa8f81
font_02_sfnt_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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