Malicious PDF — malware analysis report

Static analysis result for SHA-256 412febce4dfc09b6…

MALICIOUS

PDF

94.2 KB Created: 2021-06-02 19:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 824c88e058f9740d8d5ecf6031b243c2 SHA-1: 58dab9c0b07ae75aa1e24a09634de5ec56d1ca29 SHA-256: 412febce4dfc09b6527a7e787b009a30907325d3fe70b6ab3dd1a2547e93ffff
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a page that appears to offer solutions for a textbook, likely a lure. The PDF structure suggests it's a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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 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://wastran.ru/pbw?utm_term=shigley%2527s+mechanical+engineering+design+10th+edition+solutions+chapter+13 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421342/normal_5fdbac27e958e.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/793725.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415065/normal_5fc5f74ceffeb.pdfIn PDF document text
    • https://lejawoxaniw.weebly.com/uploads/1/3/0/7/130738778/netakix-ludazamido-koweme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486368/normal_5fca89f667083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_6064e3206b44d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463551/normal_60030e835aa05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445750/normal_5ff9117181c9c.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://minuwaxiper.pbworks.com/f/single_variable_calculus_volume_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229c91ec-fd01-4afc-8f81-f399f7d6a471/modo_de_produccion_primitivo_duracion_en_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c13002c0-22b6-47c3-80d5-d84a716b3dda/kepekufivowux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e955168-8a45-44e0-837f-5e6a5e4ff8e1/presentation_zen_ppt.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/f/adverbs_worksheet_for_grade_4_with_answers.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/w/file/fetch/144443478/rilewuwomibuwofizowegepas.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144423882/81082388995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0280d847-2824-490a-9dec-2d331a90e268/nexumiwabiwawopimono.pdfIn PDF document text
    • http://mogulobobis.pbworks.com/f/59817018272.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144416775/nenirufovekenibiz.pdfIn PDF document text
    • http://pevozowo.pbworks.com/w/file/fetch/144423927/fce_for_schools_practice_tests_2019.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/f/buchanan_county_ia_jail_inmate_search.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144457548/limiting_reactants_gizmo_answer_key_free.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144445683/58401795870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3654b5ea-df23-4570-9a02-ef895e8e7b92/pepilozekonola.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_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 8164 bytes
SHA-256: aec4c61a6296f9bd61873d291b41bc679140ead7508f7459802ac0def0591716
font_01_sfnt_off00012dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC1 6084 bytes
SHA-256: 2c70648e767570b37f3a7d1a9760f3735cd64d1709bbbdc6b49637de1fd904ca
font_02_sfnt_off00014260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14260 11684 bytes
SHA-256: cecff4bbbf8c25a4e3746b2af7fff6a4be150dc0b2b5618a21e76c2c02d09ac6