Malicious PDF — malware analysis report

Static analysis result for SHA-256 730233d03277d581…

MALICIOUS

PDF

83.5 KB Created: 2021-03-24 22:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bacccb5844d8dfef61f1d90d140b18dc SHA-1: 61bf5a2a348ebde302e8b14d2afbb1a56743bd1c SHA-256: 730233d03277d581553100229e436318b29964e125814363d4b9f1a704ee974b
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL related to converting PDF to Word, indicating a lure to trick users into clicking potentially harmful links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/award?keyword=convert+pdf+to+word+using+macro PDF link annotation
    • https://cdn.sqhk.co/wazilisiko/eAJ1YoP/42963040879.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/eIBiZmJ/the_maze_runner_series_books.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/heMm4bz/rutoniva.pdfIn PDF document text
    • https://fedoxamanisoru.weebly.com/uploads/1/3/4/6/134668372/tanugepewogur-sixikiguzikujaz-jimamopazaxuso-somimo.pdfIn PDF document text
    • http://optamorem.com/best_ladder_jokesrny9y.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/hehbRjd/93582674428.pdfIn PDF document text
    • https://wujuzuvetawi.weebly.com/uploads/1/3/1/3/131379059/8c213f14.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/0jthhaw/amazeballs_meaning_in_telugu.pdfIn PDF document text
    • http://ig-copyrightviolation.com/libros_de_magia_negra_antiguosi6f0a.pdfIn PDF document text
    • http://autokenn.com/lapezipotixozigip19tdr.pdfIn PDF document text
    • http://libertinemodels.com/mowodijonumefoletilujuls1jhx.pdfIn PDF document text
    • http://ejqy.com/face_masks_near_me_rite_aidjusqy.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/hfPK8Hq/dorenedidomawugik.pdfIn PDF document text
    • http://lupamepo.22web.org/digital_electronics_tutorial_point.pdfIn PDF document text
    • http://1gusevshop.space/division_with_decimal_remainders_ks2_worksheetsivjxg.pdfIn PDF document text
    • http://stylecurtains.com/58236343290hg0hp.pdfIn PDF document text
    • https://cdn.sqhk.co/muwanije/ihKPjbd/90310702905.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sibexelopuni.epizy.com/how_to_port_mobile_number_through_online.pdfIn PDF document text
    • http://jidoreno.epizy.com/kujibimumovuzebovoraba.pdfIn PDF document text
    • http://pesokijodaroxo.epizy.com/fundamental_patterns_of_knowing_in_nursing_carper.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 5500 bytes
SHA-256: 7b0380f94a010aa04bd5eceabe4f20b697a7744e279bd3c4796c27660a22528a
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 11536 bytes
SHA-256: 30648a07102c059f7f3d91cde622f5f11d2e6c7a7bc0a9a1e610287b3322848c
font_02_sfnt_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1