Malicious PDF — malware analysis report

Static analysis result for SHA-256 839731956ad39a3f…

MALICIOUS

PDF

75.8 KB Created: 2021-01-13 06:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a10fe380c8c054def339ae49e5aec7cf SHA-1: 929d1606caf046b21a917cda3c642d0d3ba23a48 SHA-256: 839731956ad39a3ffcc509fbac4c02f40f1d655ca69845bed491baa434edce27
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://trafffi.ru/123?utm_term=east+coast+appliances+scratch+and+dent', suggests a lure related to appliance sales, likely a phishing or scam. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure and embedded links point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=east+coast+appliances+scratch+and+dent
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/1614857.pdf
    • https://site-1177467.mozfiles.com/files/1177467/98430560130.pdf
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/getafiluz.pdf
    • https://site-1175753.mozfiles.com/files/1175753/vonunubo.pdf
    • https://cdn-cms.f-static.net/uploads/4402722/normal_5fa6251737348.pdf
    • https://cdn-cms.f-static.net/uploads/4485450/normal_5fa78a6ccad4b.pdf
    • https://site-1167931.mozfiles.com/files/1167931/61937100961.pdf
    • https://vurozagagi.weebly.com/uploads/1/3/4/6/134695821/1624809.pdf
    • https://cdn.sqhk.co/komajekolino/iazhfwZ/lumber_yard_cedar_falls_iowa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosawef/sahoo_audio_songs_naa_songs.pdf
    • https://s3.amazonaws.com/lebaxa/xazojijore.pdf
    • https://s3.amazonaws.com/tuxenipup/my_genesis_credit_home_depot.pdf
    • https://s3.amazonaws.com/nefunupu/daily_vehicle_inspection_sheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfe.bin
6bf77a2e5dcb8b2050c6e9785a9d5dde7f9e7b357ac543feb1d28ac557815038
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 5120 bytes
font_01_sfnt_off0000fe5d.bin
612b3cccd2a30491fe83be58a0f80cb52aaeceb030727df05ed80892da242a15
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 10656 bytes