Malicious PDF — malware analysis report

Static analysis result for SHA-256 e880dca29f9143f6…

MALICIOUS

PDF

98.3 KB Created: 2021-03-01 21:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f36ab90e61aeae67e49f346b7c1d2445 SHA-1: 752ba9698d47b180e2e1f0430ab7d44b7ebda7b2 SHA-256: e880dca29f9143f6f1681c2b33abd2343dcb1c6ee59e62e7081d8c99b2432031
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, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body mentions 'Tecnicas terapia cognitivo conductual para ansiedad' which is likely a lure to attract users to these external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://jacksth.ru/strik?utm_term=tecnicas+terapia+cognitivo+conductual+para+ansiedad PDF link annotation
    • http://remastacer.com/company_of_heroes_2_complete_collection_trainerimer9.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/6266213.pdfIn PDF document text
    • https://fulojexerewo.weebly.com/uploads/1/3/5/3/135345176/kofewejeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460063/normal_603af3bae02f6.pdfIn PDF document text
    • http://manthoughtswebsite.website/is_light_dead_in_death_notehnlza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379048/normal_6008b8881d0a9.pdfIn PDF document text
    • https://pasifoberili.weebly.com/uploads/1/3/4/8/134881239/vexokajuzujulig_jovigepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5fe79e9b82553.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/wasalopaxo.pdfIn PDF document text
    • http://yachts-4-sale.com/pixel_soldiers_waterlooabc9j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5fe9788188eff.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/bubari.pdfIn PDF document text
    • http://uuuuull.space/notepad_compare_files_online3sd15.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/redisenavux_tifokawamusi.pdfIn PDF document text
    • https://gisixumaxen.weebly.com/uploads/1/3/1/8/131856636/juxizafuxozeno.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/saxefi/lg_washing_machine_showing_oe_error.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/zebabufezowifu.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_off00014237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14237 5248 bytes
SHA-256: fa65b431a0cf75a1028ae8f7eea9a2b1b0196e9f0d30626921cea3494a4b6207
font_01_sfnt_off00015427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15427 11524 bytes
SHA-256: a2baac84abb1cdb2fd2ef307a05494b578e23ca2a12852e362206e225ca412c5

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