Malicious PDF — malware analysis report

Static analysis result for SHA-256 328120d54eff4941…

MALICIOUS

PDF

66.5 KB Created: 2021-01-15 00:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d29f71665d1f551d5d5bad7d267f7799 SHA-1: d82f0845d5abaa472b4f7af56938e39974237faf SHA-256: 328120d54eff4941173d3007d8271cd72551803c9f8fcc6e77eff6f1dab42e7e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://traffnew.ru/123?utm_term=anna+griffin+dies+uk
    • https://lefexaro.weebly.com/uploads/1/3/5/3/135324439/zovexivoto.pdf
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/gefudigoramoju.pdf
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/2662739.pdf
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/1fd7f.pdf
    • https://cdn.sqhk.co/jasojime/eheZR3C/mumilekuz.pdf
    • https://gogovujogizog.weebly.com/uploads/1/3/1/6/131607278/19a2f03c7e.pdf
    • https://site-1175847.mozfiles.com/files/1175847/87879960530.pdf
    • https://site-1174259.mozfiles.com/files/1174259/bodoni_bt_bold_free_font.pdf
    • https://cdn.sqhk.co/wopidaxiwuk/MKMxijn/82659933175.pdf
    • https://site-1173807.mozfiles.com/files/1173807/68883557609.pdf
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5fc098ef8e44c.pdf
    • https://site-1185944.mozfiles.com/files/1185944/tosim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nowokil/pukud.pdf
    • https://s3.amazonaws.com/jadere/xiduzirefadalumasuzofulu.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_off0000c76b.bin
1c6d32b488e6bf80668926dbf20c38d292bb0248742328a96ab3c4c77b138495		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 5096 bytes
font_01_sfnt_off0000d8d6.bin
c199f85a900cb32aed94eec8cda18128da227b14ffc6feb8c5ab314ee7e008b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 10820 bytes

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