Malicious PDF — malware analysis report

Static analysis result for SHA-256 021f0887255bff9e…

MALICIOUS

PDF

120.3 KB Created: 2021-03-03 18:05:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 37e1dc2437f1de6197ad383fce291479 SHA-1: 77a81d960a1d5537d7695bb7e20e596c3ae8d8f2 SHA-256: 021f0887255bff9ed746a3cb50bb5170a36ae6ed44ea8bab01d32164cdbd2522
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

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://ponafet.ru/strik?utm_term=what+is+irish+folk+music PDF link annotation
    • https://tenosufude.weebly.com/uploads/1/3/1/4/131455069/rujovode.pdfIn PDF document text
    • http://goodshopsales.xyz/ihss_timesheet_help_desks5sdl.pdfIn PDF document text
    • https://komijeji.weebly.com/uploads/1/3/1/6/131606126/xezuwimonodis.pdfIn PDF document text
    • http://abwaab.su/canada_food_guide_20184bfod.pdfIn PDF document text
    • https://xusopulude.weebly.com/uploads/1/3/1/0/131070786/6521291.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/413912.pdfIn PDF document text
    • https://litodamun.weebly.com/uploads/1/3/4/7/134710511/suzareguxelegi_bevesemagavavi_faniniju.pdfIn PDF document text
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/rimalet-kufenunitula-vejezu.pdfIn PDF document text
    • https://wivutukezed.weebly.com/uploads/1/3/1/4/131438473/xubawijiwisuzapiwi.pdfIn PDF document text
    • https://pegiromilu.weebly.com/uploads/1/3/4/6/134683304/tagizopesi.pdfIn PDF document text
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/2264571.pdfIn PDF document text
    • http://mbfsopg.com/dedofagetizikuguc9z.pdfIn PDF document text
    • https://malitizume.weebly.com/uploads/1/3/4/0/134097131/pofewuzal.pdfIn PDF document text
    • http://covidcapsule.world/dungeons_and_dragons_core_rulebooksh1p6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/memexelu/max_lucado_anxious_for_nothing.pdfIn PDF document text
    • http://bususetut.epizy.com/lafumebeb.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/how_to_get_rid_of_acne_scars_on_back_and_chest.pdfIn PDF document text
    • http://kolofagigetu.epizy.com/advantage_and_disadvantage_of_computer_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/alleluia_full_movie.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_off00019a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A64 5196 bytes
SHA-256: 7dfd33f9809100733af1c54bc28ab254ddaf6860aa9dd20f34d898e4aa1e38ad
font_01_sfnt_off0001abf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABF3 12200 bytes
SHA-256: 321c8e29002acf12129b85ab08f80ca313b7526872c0366f5d57bc25aa66e13a

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