Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32c6142306d46d2…

MALICIOUS

PDF

74.7 KB Created: 2021-02-26 03:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 101623c2727fc9b2b7a3909ef9f291a4 SHA-1: b941ed17c530e421606dcf9145f74eacdf70d9ad SHA-256: e32c6142306d46d2e926d21f93ac9944a920350dcde85b1a1a58659327d1856a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to obscure the final malicious destination. The document body, though heavily obfuscated, contains a lure related to 'Arm muscle building exercises with weights' and references wkhtmltopdf, indicating it was likely generated by a tool rather than being a legitimate document.

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://jacksth.ru/123?utm_term=arm+muscle+building+exercises+with+weights PDF link annotation
    • https://cdn.sqhk.co/ramojezi/idNNCkG/28893680686.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/english_learning_books_free.pdfIn PDF document text
    • http://benodemutuvi.22web.org/tifofezuzedimixidevu.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/z1zjcUh/63943250556.pdfIn PDF document text
    • http://ridunculus.com/metorifaxokagifuwadzmybs.pdfIn PDF document text
    • https://cdn.sqhk.co/jonimaze/a7r4PE4/maxanoxovubulasilokes.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/86439493186fcxgz.pdfIn PDF document text
    • http://roskycnmx.com/51429706349mvmlo.pdfIn PDF document text
    • http://tumerasiwabuzip.22web.org/pixar_short_film_lifted.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/gZ5ij3q/dragon_warrior_3_pyramid_walkthrough.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/where_can_i_watch_bosch_in_canada.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/61137770637i7kpg.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/why_is_my_refrigerator_not_working_but_my_freezer_is.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafolizol.rf.gd/82874555363.pdfIn PDF document text
    • http://komewubot.epizy.com/10931261359.pdfIn PDF document text
    • http://gelunusa.epizy.com/nodobitezobupazune.pdfIn PDF document text
    • http://kuporalegumema.epizy.com/bella_rotating_belgian_waffle_maker_manual.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_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 5432 bytes
SHA-256: d80429fe7aa6447e58ee8e9a3d571ae8f982a08d7e5496c9ef3302e648b6f12a
font_01_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 10816 bytes
SHA-256: 244aafa5d4a142d5f764c0cc9514f0bade75eac5a3049fd1b8aeafabefea89ce

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