Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe26710de5fe5f80…

MALICIOUS

PDF

79.4 KB Created: 2021-03-09 01:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 69df76bed1802506a32ca9dc99fbdec4 SHA-1: 9955e2aa4f281fc1d443769e1e81f20c6ba5d195 SHA-256: fe26710de5fe5f803bf48eb86899dad9d137bd5f694b43f016b556a5e6688573
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting or domains associated with link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to technical documentation, further supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/award?keyword=functional+programming+principles+in+scala+pdf PDF link annotation
    • http://hydra.moscow/15822602584xvgnw.pdfIn PDF document text
    • http://totevev.22web.org/81953917837.pdfIn PDF document text
    • http://bobositufunoto.iblogger.org/emergency_assembly_point.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/xitowar.pdfIn PDF document text
    • http://xamipofu.22web.org/lirisakovakinuvini.pdfIn PDF document text
    • https://rojabufofunos.weebly.com/uploads/1/3/0/7/130776514/rowuvusus.pdfIn PDF document text
    • http://flathead.us/north_america_map_blankyvimw.pdfIn PDF document text
    • http://instapriz.website/reaction_of_aldehydes_and_ketones_with_iodoform_test5si3d.pdfIn PDF document text
    • http://conicppjry.bid/apache_160_piceb12l.pdfIn PDF document text
    • http://texewofe.22web.org/48315950624.pdfIn PDF document text
    • http://rusakova.space/duforikurewexutam9uf39.pdfIn PDF document text
    • https://kotazadan.weebly.com/uploads/1/3/4/3/134349323/dododijamuse.pdfIn PDF document text
    • http://cardioactiveitalia.site/wotinoneroxonizalopeputavbs9xi.pdfIn PDF document text
    • http://mainsale.pro/353213774157rsl0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boludit.rf.gd/51559389550.pdfIn PDF document text
    • http://babupit.epizy.com/shogun_2_trainer.pdfIn PDF document text
    • http://nivigiwaragere.epizy.com/the_cell_cycle_and_checkpoints_worksheet_answers.pdfIn PDF document text
    • http://xedonufil.rf.gd/the_good_witch_series_episode_guide.pdfIn PDF document text
    • http://danofawo.rf.gd/4315720472.pdfIn PDF document text
    • http://sowinoto.epizy.com/sadifemanazuzurapolurofi.pdfIn PDF document text
    • http://totajenu.epizy.com/suwatetajogebuputifuw.pdfIn PDF document text
    • http://redexini.epizy.com/jenesutijatofozakokazekuf.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_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 5432 bytes
SHA-256: c501f850e72c8e4d1c69b3234cb89a7c6e0943ac27fa4b6f5ededbea7e7494b4
font_01_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 10608 bytes
SHA-256: 7ab83a49dea5fa7a84599fbff84f87c5c56a630f30885bf8cc53f94a130f6fca

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