Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84cf28becde3244…

MALICIOUS

PDF

70.9 KB Created: 2020-11-17 16:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 573cfbe96d3f296aae3041d408a5b427 SHA-1: 1f8496fe2160d01bfa066b1b39c9cbb1123f79e5 SHA-256: b84cf28becde3244c55dc19d7bf59a0566d14a9e1679089e1ba88fdb68333dc6
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://traffking.ru/123?utm_term=houghton+mifflin+math+answer+key+grade+8 PDF link annotation
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/29151.pdfIn PDF document text
    • https://susopusamug.weebly.com/uploads/1/3/4/3/134336197/xaxeg.pdfIn PDF document text
    • https://dajedenutiwifux.weebly.com/uploads/1/3/4/3/134318988/pinapetomal.pdfIn PDF document text
    • https://xisegebimir.weebly.com/uploads/1/3/4/3/134340076/woxajipolulofege.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/niwijilunizidu.pdfIn PDF document text
    • https://witirasa.weebly.com/uploads/1/3/4/5/134525236/wuroxurobezeno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/12661519-0f22-416f-9407-0d2798fb1ac8/sinugotur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06f113b-2b52-4db7-ad82-c916324cefcb/34643270352.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/streaming_news_illinois.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/manual_for_ryobi_gas_trimmer.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/pikasigomezadabilit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c3828e-d409-4e03-8021-5e9d7ff128e5/zojuminu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 5616 bytes
SHA-256: a2c8bd45a2d766241bff889df631d75b5e9beb3c02f863d7c26bdd2d00b6ab05
font_01_sfnt_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 10976 bytes
SHA-256: ad290e18d7775a6a2bb2a82dbfa1e7315615d7887dddbcc0926223bb5ab45049
font_02_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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