Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9f25dc2ac0583b…

MALICIOUS

PDF

66.7 KB Created: 2020-12-14 15:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c03016cb93dc5d64447839890fe9ef88 SHA-1: 1989709a7aa179f22c7d7b6c8ef8c262c9d0e542 SHA-256: 1b9f25dc2ac0583be792a4b30745e4a4374399793c0ad013a4a69d00cb0cfab9
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://traffnew.ru/123?utm_term=blocking+theatre+definition PDF link annotation
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/lupapasujariten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_5fb2f0a48daf0.pdfIn PDF document text
    • https://pudibodug.weebly.com/uploads/1/3/4/4/134464821/mefowebifirudu.pdfIn PDF document text
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/563ec52ae.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/nireleliku-todezozi.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/fubegog-zejateboba.pdfIn PDF document text
    • https://jajivinejide.weebly.com/uploads/1/3/4/3/134354145/lufuwisa_xuxuw_dixiwumezakip_nemuvabajip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5f8d1b370e435.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc13c726609fd0ee793905a/t/5fc9ea51e4017829c16de9de/1607068243345/90_degree_counterclockwise_rotation.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd01712edfcd2bda920993/1606222195400/38477299330.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc564412bbd7406582491d5/t/5fce64677ae85b53b2c69750/1607361643076/74346300323.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfe7e212facd59cea75dab/t/5fc16d4a4e98326c024603d3/1606511948048/gettube_apk_full.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a58c40f1034a5cb42298/t/5fc5bf7c9d7936484054a2a7/1606795133517/cat_basketball_games_unblocked.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_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 5216 bytes
SHA-256: eea7d51ae493583ea2c45fbac860e385be0d2615d483570aee60bce2bf7c7fcd
font_01_sfnt_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 11348 bytes
SHA-256: 266c924c087ab458520d0093221fdce5ea75dc864e234c6ea67d38c66eeffbc9

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