Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa712a9165531d5…

MALICIOUS

PDF

66.5 KB Created: 2020-12-02 12:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9107e52229412f1b62d7fb6243125b74 SHA-1: 23c4f8d3889727c02627470a608f298cc5d5ffdc SHA-256: daa712a9165531d50b5e99cb548d6f6b6d73523a5abcc25f85407a69003e0bf3
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=trinh+xuan+thuan+la+ai In PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/kukagonuwusanukul.pdfIn PDF document text
    • https://sixumegeb.weebly.com/uploads/1/3/4/4/134476160/makawodobunimosedipe.pdfIn PDF document text
    • https://tetugisiwapasuv.weebly.com/uploads/1/3/4/7/134744560/relifig_futuguzej_bodozo.pdfIn PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/bf468f274be.pdfIn PDF document text
    • https://mixekolasum.weebly.com/uploads/1/3/4/3/134388380/6581583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84d1932-39e8-4879-9298-af866e446072/14541294133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22215517-63f6-4ecc-bf8b-631cec18cff2/20th_wedding_anniversary_gift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ca422d-8ae5-4a5b-b199-e5696d296dbd/skyrim_ogmunds_house.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/93736057898.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5f8e4f98375720d7ec2d/1606377359222/takuv.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/jebuminekatinemotarofizos.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_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 4612 bytes
SHA-256: 2fd5b76c40b6f709babc7314a2c2faef31304f726acf8e9c20bb451d8ce5eb36
font_01_sfnt_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 9620 bytes
SHA-256: 34b364b5dcc939e849b50d57b70e668df837f5ae6a7ef56f6b76374fe8f77a32

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