Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a12bdf1781f03ed…

MALICIOUS

PDF

81.4 KB Created: 2021-03-07 18:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 10049364a8596e42fe6ca8c8fba258a9 SHA-1: b684c18ad878cff7d536a110785f320a56108bb5 SHA-256: 9a12bdf1781f03ed385f08230a4a881d5e71b22a264e5101752ef50ed084a2ec
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content.

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://botokaw.ru/award?keyword=my+side+of+the+mountain+summary+chapters PDF link annotation
    • https://babejogoj.weebly.com/uploads/1/3/1/8/131856270/taravof_rabonoxojas.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/what_are_some_examples_of_organizational_culture.pdfIn PDF document text
    • http://pipvip.ru/wegetinel2vln1.pdfIn PDF document text
    • http://magonawaneku.22web.org/55527315704.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/6053872.pdfIn PDF document text
    • http://pikajavepe.iblogger.org/jebesigesupifanekofanaxu.pdfIn PDF document text
    • https://takewinedol.weebly.com/uploads/1/3/4/7/134768260/d94ff59598b45c4.pdfIn PDF document text
    • http://zixonolugajona.iblogger.org/44654064712.pdfIn PDF document text
    • http://stroy-level.ru/elegoo_arduino_starter_kit_reviewjvahx.pdfIn PDF document text
    • http://damodudajipofem.22web.org/55240454836.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/jepis.pdfIn PDF document text
    • http://tawabuzawi.iblogger.org/dijomepudipirolix.pdfIn PDF document text
    • http://vojiwilobir.22web.org/how_to_master_hand_to_hand_combat.pdfIn PDF document text
    • http://sutiwejepeb.22web.org/ashrae_handbook_fundamentals_1993.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mobisojew.epizy.com/platformio_add_libraries.pdfIn PDF document text
    • http://paguxesij.myartsonline.com/jotunesekeliwufidip.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/68427241618.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/45996610808.pdfIn PDF document text
    • http://nutimuratibuzur.epizy.com/misorufufuwenajojufonov.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_off00010106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 5472 bytes
SHA-256: e29e83c3eccfac7950d49180eba6907c65145f91681e7cd8de6b98a61c0857e8
font_01_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 10712 bytes
SHA-256: a06b5aa169416c47299d7360b744cb287e3ea5a320c71f4c93d7301d7fe89ff6

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