Malicious PDF — malware analysis report

Static analysis result for SHA-256 113b23f42156d1dd…

MALICIOUS

PDF

73.6 KB Created: 2021-02-10 17:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7ef735009be1659e8df503ade13b86d5 SHA-1: 483da14e16361991608682b5a6dd4ed3e31cb658 SHA-256: 113b23f42156d1dda23869eb2c5738494b58031ae06c0e567f080254f02c1f9c
156 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 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/123?utm_term=raspberry+curd+recipe+for+cake+filling PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426541/normal_5fd91f0cc408b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407793/normal_5ffdebadcc90f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_60187f59c5b34.pdfIn PDF document text
    • https://xamatetafuxu.weebly.com/uploads/1/3/1/6/131606968/2a98b8035462.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380701/normal_5fcc994bd4128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5ffd792d0ac3d.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/woxewiwupir/dagimejebod.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/marvel_ultimate_alliance_2_wii_trivia_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/givosenukiriwun.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/89293100158.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/15572019324.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/bebutodolaxesopapiki.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/girudumaxorawanoj.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/gefokagawusapama.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/pigabolurijitibebuzofo.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/14907561714.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/rugurezaberotogebevi.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/caller_name_talker_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 5636 bytes
SHA-256: d237b99ee1cb910f3049a76eb9fb4f87742d8eb5143a4c387ceb438797033cdd
font_01_sfnt_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 10380 bytes
SHA-256: 6106642f8e38ccad0c2d00624270a9f75877ed58092614f06675637b2de9c7cc

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