Malicious PDF — malware analysis report

Static analysis result for SHA-256 b236417ce4ba999b…

MALICIOUS

PDF

81.6 KB Created: 2021-03-28 22:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b5418bd73de0b8f3f77414264efbe22d SHA-1: 855928046424acb0578ab5467f1f593479c4e6ab SHA-256: b236417ce4ba999bfbead2ad10e8c27094538c7fa6a6dfea74b3229e54fe10a7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=meaning+nature+and+scope+of+educational+psychology+pdf PDF link annotation
    • https://rixekozezoba.weebly.com/uploads/1/3/4/6/134609597/2c8c742dcea.pdfIn PDF document text
    • https://movefaka.weebly.com/uploads/1/3/5/3/135304133/lozumakuneba.pdfIn PDF document text
    • https://patijunig.weebly.com/uploads/1/3/0/9/130969449/xazemekexapaji-zabawitegewipew-pusujo-tirofit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_60152bdd5f3e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_604a3c5015238.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463810/normal_5ffc0c876d8a9.pdfIn PDF document text
    • https://nililekekikare.weebly.com/uploads/1/3/0/7/130739967/5f825198fe5b26d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_6039b1470c345.pdfIn PDF document text
    • https://jigejoxipivigif.weebly.com/uploads/1/3/4/7/134731155/potuwo-jenon-tulub-denemumiwaf.pdfIn PDF document text
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/rozevuzad.pdfIn PDF document text
    • https://lonexuganaj.weebly.com/uploads/1/3/1/8/131856054/8b0d63ede3.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/6027482.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://forezepolutaju.onlinewebshop.net/zomujowubuzawetuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce5e591d-ff21-4765-a40d-57d1562e237e/68165567809.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/mazope.pdfIn PDF document text
    • http://likasuretaw.onlinewebshop.net/22791316140.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/border_song_pk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32982a20-45c0-4aa1-94cd-4679b6e0bd15/college_algebra_test_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa50a29e-8d19-4b1b-8538-464ebbfa4750/little_house_on_the_prairie_season_1_episode_19_cast.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 5524 bytes
SHA-256: 5504c3110fbffd1dc4711e3d3a776ed066e1ec5a64fc6db70b47551dbf9b832d
font_01_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 10936 bytes
SHA-256: e242cf28e197217077a7fd5885b538cf4c429136ccaa3d58d04f281928f27eb6

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