Malicious PDF — malware analysis report

Static analysis result for SHA-256 631e4596f184255e…

MALICIOUS

PDF

77.2 KB Created: 2021-05-25 12:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 083a9fbf4534f9d6c7cc0ced3dedaaf9 SHA-1: e4b98ba0eed23fad25674218ffac5ca67c530c93 SHA-256: 631e4596f184255e4a517aaf3958c8802d5e64d15f67b509052244c8eb1e1525
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam and phishing. The primary malicious URL, 'https://seumenha.ru/strik?utm_term=mercruiser+350+mag+mpi+service+manual+download+free', suggests a lure for users searching for specific technical manuals. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_LINK_FARM' and the high ML score indicate malicious intent, likely involving JavaScript execution to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=mercruiser+350+mag+mpi+service+manual+download+free
    • https://gebedosoxabitox.weebly.com/uploads/1/3/5/3/135324181/masumire-vapeborimi-fajefiwagete-tadizazalaru.pdf
    • https://tatazopizen.weebly.com/uploads/1/3/1/1/131163492/4716851.pdf
    • https://cdn-cms.f-static.net/uploads/4470832/normal_6053bc905eb82.pdf
    • https://lonexuganaj.weebly.com/uploads/1/3/1/8/131856054/aa58bf.pdf
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/xetokejujebodorel.pdf
    • https://wowuleraregode.weebly.com/uploads/1/3/4/6/134690179/685358b.pdf
    • https://jowidirususonin.weebly.com/uploads/1/3/0/7/130775515/ee9c935c522.pdf
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/e7b0cd41136.pdf
    • https://ditufanavuj.weebly.com/uploads/1/3/0/7/130738569/fd4d401f5ab6a1c.pdf
    • https://cdn-cms.f-static.net/uploads/4408881/normal_605aca334f4be.pdf
    • https://static.s123-cdn-static.com/uploads/4368979/normal_5ff2369280ce4.pdf
    • https://sanituwinera.weebly.com/uploads/1/3/1/3/131379206/7012389.pdf
    • https://static.s123-cdn-static.com/uploads/4492586/normal_5fc8d76b34e07.pdf
    • https://wapapoda.weebly.com/uploads/1/3/4/5/134581042/fezepelawujasanur.pdf
    • https://tedagenuv.weebly.com/uploads/1/3/2/6/132682668/rezij.pdf
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/nakasexuwebuda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kabisebax/what_is_the_definition_of_power_electronics.pdf
    • https://s3.amazonaws.com/lixasifasi/71014425884.pdf
    • https://s3.amazonaws.com/gupawupigawono/frasi_auguri_compleanno_formali.pdf
    • https://s3.amazonaws.com/tirimofufemukat/exercise_book_mockup_free.pdf
    • https://s3.amazonaws.com/xezonijida/54598547112.pdf
    • https://s3.amazonaws.com/julexekubaj/answers_appraisal_questions.pdf
    • https://s3.amazonaws.com/nilafafakem/best_digital_agency_website_templates.pdf
    • https://s3.amazonaws.com/tejuvonixag/16214294832.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_off0000ea3b.bin
b5ebb65bdbcac18d552fe4c99710e7c700328937122356faf26f477380f860f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 6060 bytes
font_01_sfnt_off0000fee5.bin
3b68f4aca3e47ade1bd3443cbcefd91595815c878a47cbf3ae2b1587914f8cac
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 11164 bytes