Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77aa67c35c790a8…

MALICIOUS

PDF

68.7 KB Created: 2020-11-25 04:23:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9f73b50208e62fb5c7d2427ce0749a1f SHA-1: 1872a0f7664492d60ac785a214283b5066aad779 SHA-256: a77aa67c35c790a856a15bb2af69894d7ff11b60193c796f6dbe279e8d3db92a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing or trojan variant. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

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://trafffe.ru/123?utm_term=neverwinter+omu+hunts+guide PDF link annotation
    • https://guxikotazo.weebly.com/uploads/1/3/4/7/134704652/someriwaz_vezujewa_dajomuwojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471512/normal_5faffa90a5a64.pdfIn PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/9151299.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/3442074.pdfIn PDF document text
    • https://jolezutixuzusav.weebly.com/uploads/1/3/4/6/134605000/walajusonog-jubepowoke-xukutowalora-juguxufi.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://s3.amazonaws.com/desenaz/94650555869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9701a6d-f480-4060-91af-c9040c993457/zozesak.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/2046366872.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/clash_royale_online_generator_for_gems.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/dutobuvude.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/bow_tie_template_sewing.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/50033286529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8773cc-e2b4-4b09-9a84-efb2360a8ee3/liteboleg.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/91678149853.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_off0000c270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC270 5000 bytes
SHA-256: f237c477dd6512915837c89edbd4a179791d6e5f9625a402b359257926d52e5e
font_01_sfnt_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 10896 bytes
SHA-256: e4bec57c0b3a8f4a0643bc059984c99fe7e0a8338f176e7711ae62f97127d81f
font_02_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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