Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e418479a02e662…

MALICIOUS

PDF

73.4 KB Created: 2021-02-23 02:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 45fd8a520cebdcbbe5aa57aebdebafa7 SHA-1: 14d6dfd26fee1ff00f6be0f36f6ddf6021005270 SHA-256: 33e418479a02e6624db69dcc1a19ffcfd8413a11ce9c498a499c2d0799785bf0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though partially corrupted, contains text related to 'Hp 4630 printer not working', suggesting a lure. The presence of external URIs, particularly one pointing to 'jacksth.ru', and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution attempt. The file's structure and embedded content are consistent with a malicious PDF designed to trick users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wb?keyword=hp%204630%20printer%20not%20working PDF link annotation
    • http://thesalle.xyz/corretor_de_gramatica_em_ingles_onlineahadp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418963/normal_60187e257baac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_6025e0206ad47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466666/normal_6005600e289f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_5fd95f17e2b33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420761/normal_5fc87ac914eb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5ff3dd0fc1425.pdfIn PDF document text
    • http://vodoroding.info/jadirubusovibukiledosateetl0.pdfIn PDF document text
    • https://cdn.sqhk.co/diwewiduvaz/d18jecd/12628331773.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/h53jbF0/zewewot.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/6omiyha/sorojutinunuvabesorari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420748/normal_600b91f969a69.pdfIn PDF document text
    • https://cdn.sqhk.co/topazawu/ihxjcha/stick_fighter_unblocked_2_player.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dupula/amazon_instant_video_android_app_chromecast.pdfIn PDF document text
    • http://karifopiti.epizy.com/35731900688.pdfIn PDF document text
    • http://kepinud.rf.gd/tefasibexakif.pdfIn PDF document text
    • http://fokibuzevurir.rf.gd/pikesesewasile.pdfIn PDF document text
    • http://gagonunanu.epizy.com/baby_mama_dance_song_itunes.pdfIn PDF document text
    • http://magomodatibotu.epizy.com/tulejazivog.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/the_immigrant_joanie_madden_sheet_music.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_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 5232 bytes
SHA-256: ee4217d11596813229593558f1f25cb3c4ae6e6f95d5b4f8be9a0e95617fb825
font_01_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 10320 bytes
SHA-256: 990669b07ad6068e844a60c88925e11c95c842b755cf103d29e7386a385d8892

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