Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a710ba427cba03…

MALICIOUS

PDF

71.0 KB Created: 2021-02-13 04:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7a9c8ee6b8f55023bdc5720c1b5f0a41 SHA-1: 2a22a6d307c5c44560123de4f9c0b1210ebcf689 SHA-256: 60a710ba427cba032bc16f506cd14bcedcb7710e842721b5cbde68da1d9740b1
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and link farms, indicating a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or conduct phishing attacks.

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://seumenha.ru/wix?keyword=the+maker%2527s+diet+pdf PDF link annotation
    • https://cdn.sqhk.co/gusiloxi/kidhiXD/68788339103.pdfIn PDF document text
    • http://fruittea.space/47035519758p0rsk.pdfIn PDF document text
    • http://slimitalia.space/manuale_di_easeus_todo_backup7d8ag.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/KCeiegd/43711771138.pdfIn PDF document text
    • http://porn77.design/34260676723y5rn1.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/giiihhC/vintage_retro_furniture_warehouse.pdfIn PDF document text
    • https://lemusovigezamo.weebly.com/uploads/1/3/1/3/131381045/8864147.pdfIn PDF document text
    • http://tricitysikhs.com/live_stream_tv_free_trial7q49m.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/lijotud.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/ohjhg0a/gesevofixinema.pdfIn PDF document text
    • https://bitilidejiv.weebly.com/uploads/1/3/4/4/134442737/vakazidope.pdfIn PDF document text
    • http://lg-copyright.com/android_studio_multiline_comment_shortcut3qi6f.pdfIn PDF document text
    • https://megoximigiwuboz.weebly.com/uploads/1/3/4/5/134579220/zuzetarefitex-kepabega-rizovofaxegilan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://weralawubuzeg.epizy.com/bescherelle_conjugaison_espagnol.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_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 5296 bytes
SHA-256: 8a77cc05e9b672d8afaae1509a5316f479939ec4c0370c7590f43535c3399eb9
font_01_sfnt_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 10764 bytes
SHA-256: 575dca693b9911d0c551f819ad0917dfb1d3dc4f85cf3ad47ba9a42125b404ce

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