Malicious PDF — malware analysis report

Static analysis result for SHA-256 8befd9b5f894fd94…

MALICIOUS

PDF

79.1 KB Created: 2021-05-25 14:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d2c9a22475df46cec16206ee36321b9a SHA-1: 725beb80ff42dd743b59f2e382c88cd80b4cdf81 SHA-256: 8befd9b5f894fd948491147f27ba08523625fd2064430af3369a6a4055449aed
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 other PDF files, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=is+maze+runner+death+cure+coming+to+netflix PDF link annotation
    • https://rolobidixogiru.weebly.com/uploads/1/3/1/6/131637372/27876c.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/9878924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468537/normal_600d6ac80f2ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385852/normal_606b89b46cf51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/23404601292.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/moonkin_form_quest.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/besharam_movie_song_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/stock_markets_live_updates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00759103-19f5-4e8d-9712-ef03ffb5b8eb/35547990856.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/direct_and_indirect_variation_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0f89ec-07fb-4c12-bd6b-dc67d42f46c6/18884160459.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/24794225505.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/2131314871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6929ba4b-b394-4414-b809-a3be2eef6dfe/libavudekejesedonijepufo.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/post_bretton_woods_system.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/garmin_gps_60_review.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_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 5492 bytes
SHA-256: fbdb9d27a9a6ae85efc0bc25efcc1b9221f17a0a083d0314b9b5afbd86d4ee57
font_01_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 11476 bytes
SHA-256: 46e7aea24df34281b714e5462a958842ef6e550d51fa011863c58a2457b29b3f

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