Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b8c63822f80a0d…

MALICIOUS

PDF

67.4 KB Created: 2020-11-12 14:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 582f3895ee2bcdf5354f38b25f135267 SHA-1: 2480a1143574e403c010307ed3108269689ded3a SHA-256: a3b8c63822f80a0d024f2530a951eac9776e11b2fefb0c76ee8904a6b2716776
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/123?utm_term=it+2+2019+google+docs PDF link annotation
    • https://xekurinesore.weebly.com/uploads/1/3/4/4/134478887/juvevuzo-befakefiro-sobadalidi-pugixixaned.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5f8c6506debc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444638/normal_5fa6cf6523482.pdfIn PDF document text
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/9698626.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/betireb_kujubib.pdfIn PDF document text
    • https://xexofomes.weebly.com/uploads/1/3/4/4/134489610/gojasirizutafes-tovanozekibezu-debor-zadoxexeti.pdfIn PDF document text
    • https://pawasisuleti.weebly.com/uploads/1/3/4/6/134652657/78be016b774829.pdfIn PDF document text
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/bosalusazubanido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wusone/49023734186.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/999898367.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/diapositivas_de_powerpoint_gratis.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_off0000cc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2B 5220 bytes
SHA-256: d0bd097d25e7b9b28921bb7584646fbfea59c603599e0785f474211b897df158
font_01_sfnt_off0000de0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 10320 bytes
SHA-256: 0a5c1d66a89a30cd0902bee2b581c308c1444ea37463fe60ac7f6e599230909b

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