Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ed5917260a366c…

MALICIOUS

PDF

76.1 KB Created: 2021-01-21 14:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cbbf0f55f188233d66d493b3943fc129 SHA-1: 7834dc313bf05df701e4dfe00100060be11e74be SHA-256: 37ed5917260a366caaa790429a66921f8f3e4af238cb93d1968843036d85ee6e
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with the primary purpose of directing users to potentially malicious websites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. The presence of URLs like 'https://trafficel.ru/123?utm_term=stanley+mechanics+tool+set+252' suggests a lure related to product searches, likely leading to phishing or malware distribution.

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://trafficel.ru/123?utm_term=stanley+mechanics+tool+set+252 PDF link annotation
    • https://cdn.sqhk.co/xomakonezema/ijekunM/39919574488.pdfIn PDF document text
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/2124306.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/gjhaedW/rovuril.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/ihjfChe/95549074584.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/Lgejhig/radujoropulapiwolo.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/ib5igto/malusef.pdfIn PDF document text
    • https://juwaxevepatasi.weebly.com/uploads/1/3/0/8/130874094/bc05697d2288177.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/jNie5t4/30243838852.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/egciauv/liverpool_champions_league_2020_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/Xbzq4Hv/amazon_seller_central_uk_fees.pdfIn PDF document text
    • https://cdn.sqhk.co/rejiwosujupa/04nkBge/does_new_mexico_accept_electronic_proof_of_insurance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gubodasitonobu.epizy.com/wutopotiweziduwabudun.pdfIn PDF document text
    • http://vajipiposugeto.rf.gd/first_week_kindergarten_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/melebebisanaxojapasix.pdfIn PDF document text
    • http://memegimowa.epizy.com/80800854953.pdfIn PDF document text
    • http://gexegufikide.epizy.com/free_indesign_template_presentation_folder.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_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 5404 bytes
SHA-256: 7bab5b4bae172f726d0c62a779675efee070b21aafbd7db37c101ed8198e0164
font_01_sfnt_off00010094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 10108 bytes
SHA-256: 785ee38968add897766c0a3e5a632d21bd4de266763380b0a7a665591e16a158

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