Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa6f0fedaf3f595…

MALICIOUS

PDF

61.5 KB Created: 2020-12-02 09:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b093e9e995845886e1e35ccc61cd1ff6 SHA-1: ed6220766e7fde00ce533fc5774d92de09483a49 SHA-256: cfa6f0fedaf3f595c6f7db9b0ce838e67dc53e2f0b918abbb6e9dad8fbae7ca9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of embedded external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=airsoft+mosin+nagant+scope PDF link annotation
    • https://bipalokepug.weebly.com/uploads/1/3/4/4/134492575/woxuzadelizamasa.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/29fd10800.pdfIn PDF document text
    • https://wimupivirexov.weebly.com/uploads/1/3/4/9/134901171/9598077.pdfIn PDF document text
    • https://bejitukinerebi.weebly.com/uploads/1/3/4/8/134890105/pumefur-batugimifubem-vurenug-rakar.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/65b2502a-fe3b-4dfb-83de-ac82f0d05ea9/duwepobumitavovekolizopul.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/bhp_full_form_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/jio_music_apkmonk_29_nov_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/family_gifs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/70148274918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd674e1-dc52-4150-9297-fc27dd06aa98/48721989925.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/21339377866.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/45166143230.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/cadbury_dairy_milk_top_deck_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/constraintlayout_barrier_vs_guideline.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_off0000b373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB373 5292 bytes
SHA-256: 7f751ef5c738e67e6646b066eab98c7ca794b8b2a0248a5f64371f2bab9c6893
font_01_sfnt_off0000c566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 10416 bytes
SHA-256: 09318c87c0a356dca4599230f582e8058e783cb57d1bad18301d07bb83442bb4

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