Malicious PDF — malware analysis report

Static analysis result for SHA-256 979fdbb99c8fac39…

MALICIOUS

PDF

69.4 KB Created: 2021-01-17 05:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ff72eb76255d6fb637c368c4c05fc72f SHA-1: b63ce7b700ca32d3c4861d529a63eeb1b70f62a2 SHA-256: 979fdbb99c8fac3909c9d71e005f531232ce2bc941ba6fb4e77063915cfd07d0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple external URIs, including one pointing to 'traffset.ru' with a keyword suggesting job lures. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and job keywords, reinforcing the phishing pretext. No scripts were extracted, but the presence of external links and the overall detection suggest a phishing campaign aiming to redirect users to malicious sites.

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 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://traffset.ru/wb?keyword=dominos%20delivery%20jobs%20pay PDF link annotation
    • https://site-1177446.mozfiles.com/files/1177446/arerey_manasa_idantha_nijama_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454999/normal_5fd810e5693d2.pdfIn PDF document text
    • https://site-1178760.mozfiles.com/files/1178760/falling_action_definition_literature_example.pdfIn PDF document text
    • https://site-1181123.mozfiles.com/files/1181123/jusus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428078/normal_5fa098177651a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419629/normal_5ff5e8761ff18.pdfIn PDF document text
    • https://site-1199955.mozfiles.com/files/1199955/captioning_and_court_reporting_jobs_edmonton.pdfIn PDF document text
    • https://site-1177426.mozfiles.com/files/1177426/23959609172.pdfIn PDF document text
    • https://site-1172403.mozfiles.com/files/1172403/dubowijakuzenukafamerabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501193/normal_5fcf534c8f2ff.pdfIn PDF document text
    • https://wirazalalotun.weebly.com/uploads/1/3/0/7/130776536/9641354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5f9c3bc0c11db.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/panalipolifod/96032722992.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/ruwedexagimujofo.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/64616299907.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/gradle_build_failed_android_studio_3._5.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_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 5480 bytes
SHA-256: 447e06b2127b98a0c7d359aa337ec47f7d27a069de55d64dfd155741950015b5
font_01_sfnt_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 10292 bytes
SHA-256: 8fd3dd0ae39a32e35322cd4731795dcbfa3bd4f8dfb48ff33bd9eec6d2467aa0

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