Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13c2c5a01a3460d…

MALICIOUS

PDF

72.3 KB Created: 2021-02-18 07:36:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df0d7d3fce7d0890b46f5ebbe527c20c SHA-1: 97d5c6aa65cc8ddd69381a73936b44d0a2bd231c SHA-256: d13c2c5a01a3460d8a02d36bcc2cc367747925a17afb9519e5f306bf42d5d075
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URLs point towards an attempt to redirect users to potentially malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=incendiary+ammo+modern+warfare PDF link annotation
    • http://usersdeviceprotectionservice.site/419403472665u4tn.pdfIn PDF document text
    • http://rezotu.xyz/38787891595du42g.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/zajolexut-jonawalomobi.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/49340b.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/lovefuvo-simalodug-valulotenox.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/area_of_triangle_using_determinant_worksheet.pdfIn PDF document text
    • http://leaninrzpd.site/sennheiser_mic_ew_100_g3oujvc.pdfIn PDF document text
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/wugilaposowadomopa.pdfIn PDF document text
    • http://voztrans.ru/the_last_stand_union_city_unblockedbq8vw.pdfIn PDF document text
    • http://natnat.fun/wolf_simulator_evolutionsedjy.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/5601f44d340464.pdfIn PDF document text
    • https://xadadoroz.weebly.com/uploads/1/3/6/0/136024884/3595850.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paguvano.epizy.com/3441797632.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/gifinenunotusonebusofin.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/noranojokisinagirebike.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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 5088 bytes
SHA-256: 9f2117590cc4af07f028c38c0d3315142f209a06e444ee20fc1a467129b6f711
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 12372 bytes
SHA-256: e36441e4aff04885d1533274a6527f5afd3f84674ca495bb70068e830d1f08a7

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