Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e5e55d0648101e…

MALICIOUS

PDF

71.3 KB Created: 2021-01-25 19:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6be93465bfe2b1fed89dd78d2565886f SHA-1: 4627a707900f13837c7b5d2cce26e7ea5883d6dd SHA-256: 26e5e55d0648101efa1943c17142a70c84b89f70e5fa6930d6574df482704ac6
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, potentially to redirect users to phishing sites or download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=fire+emblem+heroes+guidance+river+crossing PDF link annotation
    • http://zomuregunaradu.iblogger.org/23140068350.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/gcif0Nr/dog_sim_online_turbo_rocket_games.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/ehboFOf/zozikuzageju.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/fUghUia/80027003169.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/dheigib/kirujokofasegexek.pdfIn PDF document text
    • https://cdn.sqhk.co/libodinidep/jbhgmPf/underhand_barbell_row_vs_overhand.pdfIn PDF document text
    • https://tiramanab.weebly.com/uploads/1/3/1/8/131856622/gilozu.pdfIn PDF document text
    • http://dusosax.66ghz.com/64434019851.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/rico9f9/29437944415.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://menasore.epizy.com/juwedaguxun.pdfIn PDF document text
    • http://mutodilevo.epizy.com/bleeding_love_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/python_bottle_form_example.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/68111175188.pdfIn PDF document text
    • http://wepinipinalojud.epizy.com/69394670045.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/maplestory_shadower_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/tisewewepo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 5508 bytes
SHA-256: 11dd16d0b5380c267cf36fda3dd7faece4a4b9a48dc7846b765e7930a5b87577
font_01_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 10640 bytes
SHA-256: cb01258a5c6f12076389e5e520ed41b058a5089e26b4d8bd8de01c1c6ec2ed79

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