Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f820bfb6a19c36…

MALICIOUS

PDF

70.1 KB Created: 2020-11-20 03:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: db2e423a6d812f428ef16ed34c966bd7 SHA-1: f29faeed5262fe19d85002e55d23e5953a831b3e SHA-256: d4f820bfb6a19c36bd4e824cb3161c6c12753e0081f30a87fecc9d5e33b4bf75
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

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
  • 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.
  • 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://trafffi.ru/aws?utm_term=echocardiography+report+ef PDF link annotation
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/wewoso.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/c25f730.pdfIn PDF document text
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/xobab.pdfIn PDF document text
    • https://lopufofogepuxal.weebly.com/uploads/1/3/4/6/134695200/0ba92452a5fd.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/raluxebasogu.pdfIn PDF document text
    • https://borusolu.weebly.com/uploads/1/3/4/3/134327960/kobitanoze_xiwupirasiva.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/3870575.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/vavale/grim_soul_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6dd8c9-e666-454c-b710-e05d9dac7d3a/the_exorcism_of_emily_rose_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aab2fa5-9fe4-4f1c-b2d7-7d281c5698e9/pumejigofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be50e873-b6ba-40b1-9824-61a4e8fa8f0f/calendar_planner_2019_2020_academic.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/27764930888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12abd20-db3e-471c-a138-d58af78d13b0/devusonen.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_off0000c8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E2 4948 bytes
SHA-256: a48ca0cb930814925d84c3bf7d6afb124d203b7e92d10b6226cada510caa8f9e
font_01_sfnt_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 10444 bytes
SHA-256: 1df593cc3871a3039b4155ffe99c591f81ad0515817ad3fe03f313bb14641316
font_02_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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