Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d0dba502efdb75…

MALICIOUS

PDF

72.5 KB Created: 2021-04-04 06:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7e0f52ab1babcdd4d0a1cf542935494 SHA-1: 4a9fab2fd950f3c0ec685ab17a9e24d410910e84 SHA-256: e2d0dba502efdb7594e4aed5e22883fe7c2b3fb0da4b94da872b2a9dceed4bbb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or link farms, indicating a likely SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=craftsman+ys4500+mower+deck+belt+size
    • https://cdn.sqhk.co/tivinarafuvu/wsohbFa/39987427473.pdf
    • https://kowadesilokawu.weebly.com/uploads/1/3/4/2/134265693/pigipirafuvel-zolugalowoneb-fomekoguk-jebawonilijawel.pdf
    • http://luxisulejoxo.getenjoyment.net/82409116749.pdf
    • https://static.s123-cdn-static.com/uploads/4454967/normal_6008e9b31bac9.pdf
    • https://cdn.sqhk.co/lipetebo/2Umiayp/68950445928.pdf
    • https://static.s123-cdn-static.com/uploads/4469850/normal_600816592089c.pdf
    • https://palarijebatexo.weebly.com/uploads/1/3/4/3/134338538/27d54a0c3f2bfe7.pdf
    • https://cdn-cms.f-static.net/uploads/4382961/normal_6050395b73af7.pdf
    • http://rowefuzoj.mygamesonline.org/50530594684.pdf
    • https://rokelabik.weebly.com/uploads/1/3/0/8/130813827/3693406.pdf
    • https://cdn-cms.f-static.net/uploads/4382430/normal_6059f10489e04.pdf
    • http://zibepifutidi.sportsontheweb.net/gabafifogewosuloxew.pdf
    • https://zidadosivifaju.weebly.com/uploads/1/3/0/7/130775619/ruraxavopeni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/metubevozisul/gojomafedusomitokeri.pdf
    • https://s3.amazonaws.com/padanivozeb/17382796555.pdf
    • https://s3.amazonaws.com/xulikamul/posizobirakilusexiram.pdf
    • https://s3.amazonaws.com/xukonakefules/jixotowiguxavetekuporux.pdf
    • https://s3.amazonaws.com/minabiwa/nizuwi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74d.bin
61ee161470526f475d55c819e5b310a85521785a028c6e6264c87fa703284f90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 5872 bytes
font_01_sfnt_off0000eb61.bin
24b4422316f1cdc3f1e0eaa28c6304128a55f1dd1f96f4197a409a356b4a6170		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 12104 bytes

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