Malicious PDF — malware analysis report

Static analysis result for SHA-256 efda5cc0df52fdb9…

MALICIOUS

PDF

71.0 KB Created: 2021-02-15 15:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e43276ac4b1384d8a27de40c3c243b70 SHA-1: 230b50d3ce01683d974b8271f46d6f17ba292d56 SHA-256: efda5cc0df52fdb9b21b495a3abede87b51c31e2617bb5e809febf307f1ab2fc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojanized document. The presence of a large number of external links, including one pointing to 'bologen.ru', suggests an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious intent, likely related to 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://bologen.ru/123?utm_term=delonghi+portable+air+conditioner+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453888/normal_60078a5bebf44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382430/normal_5fed704337287.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426676/normal_5fde11b79a24c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482012/normal_5ffcac55842d9.pdfIn PDF document text
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/nilitezezitali_muwib.pdfIn PDF document text
    • http://czecheducation.space/atlas_anatomy_2017_apkxqrff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476001/normal_5ffd5cbb4a8c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_60222fbcae36f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5fdb95d8d3802.pdfIn PDF document text
    • http://pc-remont.website/gefukozagibabulevocc9dg.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/5ibXhcd/best_c64_emulator_linux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427093/normal_5ffd6c0cc1239.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/gdjgJjg/download_game_studio_tycoon_2_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470677/normal_5fdcfe92379c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451049/normal_5fcc14e47ebd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_60149f0f9ca76.pdfIn PDF document text
    • http://complect-tech.ru/instagram_community_guidelines_updatew76w2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 5476 bytes
SHA-256: d3b27800d6c99cb03f2a294c6fc1d98fa188b38ab008f4a7110b07780525166e
font_01_sfnt_off0000e8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 11640 bytes
SHA-256: 7a91dfadd91b68d45af66c6a95d0a0baaa5476c72f1b86c3050fd6d48be38e62

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