Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9739d4dc48e001…

MALICIOUS

PDF

61.9 KB Created: 2021-01-10 19:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 039abcc4e3c0367b084d8b524475f5c5 SHA-1: a2a945af98fc1491e3cc0f396af9abd0171412c4 SHA-256: 7a9739d4dc48e001e774dfcc00623f036a5a82ec76a86c38f0d7865cd078fcd6
244 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content or phish users. The presence of a link to a known malicious redirector and the ML classifier's high confidence score strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to drive users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/wb?keyword=skycraft%20game%20rpg In PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/7087518.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/durujesonejijuzep.pdfIn PDF document text
    • https://site-1171785.mozfiles.com/files/1171785/alien_vs_human_game_y8.pdfIn PDF document text
    • https://wosefekolejareb.weebly.com/uploads/1/3/4/3/134340916/4974136.pdfIn PDF document text
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/3d01cc4.pdfIn PDF document text
    • https://site-1175236.mozfiles.com/files/1175236/wifi_analyzer_android_app_download.pdfIn PDF document text
    • https://dejizova.weebly.com/uploads/1/3/3/9/133986792/nakolejeduf_wiziwewufami_sitijivesowuz.pdfIn PDF document text
    • https://pudijubo.weebly.com/uploads/1/3/4/3/134311311/876046.pdfIn PDF document text
    • https://wapofowivukixog.weebly.com/uploads/1/3/4/0/134017250/642e19f5.pdfIn PDF document text
    • https://jasevumoxemu.weebly.com/uploads/1/3/4/7/134707335/ccc6ee8139273.pdfIn PDF document text
    • https://terowibew.weebly.com/uploads/1/3/4/3/134370771/todasuxine-kidimelabesetos-diwozupene.pdfIn PDF document text
    • https://dotubebiwujodej.weebly.com/uploads/1/3/4/7/134701593/gepadejamilozuv_levogelu.pdfIn PDF document text
    • https://site-1171796.mozfiles.com/files/1171796/wavovi.pdfIn PDF document text
    • https://guzejanum.weebly.com/uploads/1/3/4/6/134681017/monavagexe.pdfIn PDF document text
    • https://site-1174133.mozfiles.com/files/1174133/physics_conversion_sheet.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/subud/69231707802.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/votidoremoregejodogebu.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_off0000b4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AC 5392 bytes
SHA-256: f0e6a0d27ee6abfe75112e709f96fb6e6a1978619749dfe6b103f2db0cba00fc
font_01_sfnt_off0000c70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 10580 bytes
SHA-256: 364017d4298d2397dc74122ced55dbf82d3cad5b0e0bca83d04a0d1c5c41f8c1

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