Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc3b45158ba5b71…

MALICIOUS

PDF

67.7 KB Created: 2021-02-20 01:13:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1e54aa9a49d9af0cbd0abdc93e968092 SHA-1: d80bf4be53fab64cabf3b5d59fcabc67ae9a0c97 SHA-256: bdc3b45158ba5b71a171f68c69eb9747063f2e45a63e02c8549d5e96f2fd1d1e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://jottigo.ru/wix?keyword=chapter+prologue+the+rise+of+democratic+ideas+crossword+puzzle+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451556/normal_60062b62a5090.pdfIn PDF document text
    • https://dosogomufafana.weebly.com/uploads/1/3/2/6/132696174/duwisuf_jenegakejit_sudikik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380229/normal_60036d03cba03.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/8hh6gjY/crunchyroll_store_review.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/lexubexasosobuvakafo.pdfIn PDF document text
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/xujuvimuve-mabobogibadovek.pdfIn PDF document text
    • https://lepabamun.weebly.com/uploads/1/3/1/6/131636917/bekevane-fubowinifevelo-wekopazimekegor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418991/normal_6002b337a12b3.pdfIn PDF document text
    • https://fesoviso.weebly.com/uploads/1/3/4/7/134710514/7864596.pdfIn PDF document text
    • https://vumukawa.weebly.com/uploads/1/3/4/6/134662430/04e6522b63.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/9giA5ig/37959312116.pdfIn PDF document text
    • https://sazaburesifug.weebly.com/uploads/1/3/4/2/134265765/79c3bfade.pdfIn PDF document text
    • https://gikotaduxig.weebly.com/uploads/1/3/1/4/131454052/d7075f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454967/normal_5ff8a1952aea4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xedaripa.epizy.com/5408504840.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_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 5616 bytes
SHA-256: 097c0b57159c5d602fd6822677d52063a9242b9fa1b32413d85dd622437f9b26
font_01_sfnt_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 10348 bytes
SHA-256: d57441d6157160041746bf2f4a3823582c22412bcdede25d99d4ce965f4492a0

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