Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c735df6c5403e20…

MALICIOUS

PDF

83.1 KB Created: 2021-05-11 04:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: adaeb485784d09501a0c65e8a0cc1cc8 SHA-1: 2847fbdbe38c28b2b2d60b7b4071bf4007341e52 SHA-256: 6c735df6c5403e208452523d425fe4eae9a6778f59087ce5389e9448ba12ce84
186 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains a large number of external links, many pointing to disposable domains, indicating a link farm. One of the URLs, https://jumiwimov.ru/strik?utm_term=bully+dog+gt+diesel+tuner+problems, suggests a potential phishing or scam lure related to 'Bully dog gt diesel tuner problems'. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent, possibly to distribute further malware or conduct phishing.

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://jumiwimov.ru/strik?utm_term=bully+dog+gt+diesel+tuner+problems PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481539/normal_606e2c0948bce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_5fe6e0602299c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5fdf00f961bb6.pdfIn PDF document text
    • http://mamubisuk.mypressonline.com/92133837315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451971/normal_5fdc273678733.pdfIn PDF document text
    • https://cdn.sqhk.co/vibesadebo/WhdOljd/45282728378.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/3892373034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462350/normal_602284b73a703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_6033c7162066e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426063/normal_5fe50b717b9f7.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/fdfc4fdacd7501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_6048673749faa.pdfIn PDF document text
    • http://fibilif.iblogger.org/grade_10_12_biology_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/9Lg0ago/instagram_logo_black_background.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/95643272442.pdfIn PDF document text
    • https://cdn.sqhk.co/kikepedu/dTiggg2/9620441904.pdfIn PDF document text
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/15d5c52e6e251c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_602f7ea8b9502.pdfIn PDF document text
    • https://cdn.sqhk.co/fakujodi/1hgjfij/from_paris_with_love_melody_gardot_traduction.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nugonubofatu.epizy.com/nepaxegepidosomexoneju.pdfIn PDF document text
    • http://mifofofavu.rf.gd/70141329399.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_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 5360 bytes
SHA-256: c208a08f16134589655d6c922fcbd7c53dea47a3ce8706dde3fb45e983fea0d3
font_01_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 10748 bytes
SHA-256: 0cac31127fa19dc0f6cac20678eec882be91c2845205c195ade11e1e7cf3c4b2