Malicious PDF — malware analysis report

Static analysis result for SHA-256 c506bd7703f426ae…

MALICIOUS

PDF

79.7 KB Created: 2021-04-04 14:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5ebbe63d32cebdedea55d911d68bfcae SHA-1: 6cea1ef33fa98a2cde8aef18cfdab4cabdeb56d4 SHA-256: c506bd7703f426ae6512b1c970989709a61825f8418a69e818352978436228a4
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 malicious intent. The document contains numerous embedded URLs that point to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

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://golowaki.ru/award?keyword=bedpan+commando+pdf PDF link annotation
    • https://cdn.sqhk.co/vusutesilo/ghaheRf/mp4_filmy._com_bollywood_movies.pdfIn PDF document text
    • http://mujujefepodejat.iblogger.org/79014708909.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/ghhhfL9/wodoju.pdfIn PDF document text
    • http://fipopogukol.iblogger.org/powovuxivagawitevupelo.pdfIn PDF document text
    • http://thechambre.xyz/is_it_wrong_to_pick_up_a_girl_in_a_dungeon_light_novel_baka-tsuki39pd7.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/he3hijg/tennis_racket_3d_object.pdfIn PDF document text
    • http://aduo5.online/lewobaziletodemozak939fn.pdfIn PDF document text
    • http://botomovosisivod.22web.org/charlie_parker_billie_s_bounce_solo.pdfIn PDF document text
    • http://testvvd.xyz/fofamuvetasifewuwifl5hvm.pdfIn PDF document text
    • http://1yamal.space/95057315474o0xvt.pdfIn PDF document text
    • http://momentshop.website/ritopapojaledemupixoqn8mp.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/FNjgifN/twist_hit_app.pdfIn PDF document text
    • https://cdn.sqhk.co/varugefezum/pTM66HT/logagugenejokudajotuzopuj.pdfIn PDF document text
    • https://cdn.sqhk.co/ladesajisama/ciepzha/i_wish_lyrics_cher_lloyd_ft_t._i.pdfIn PDF document text
    • http://mandarins.space/happy_birthday_images_for_boyfriend_freerghts.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/Egi5jfD/matejokapuwerofizaxize.pdfIn PDF document text
    • http://the-glow.ru/paluvufogefodetafolazumivegp5g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fakesux.epizy.com/33606327188.pdfIn PDF document text
    • http://natadomemorad.epizy.com/dashboard_excel_templates_free.pdfIn PDF document text
    • http://waxuxeg.rf.gd/car_accident_report_alabama.pdfIn PDF document text
    • http://sujetokotew.rf.gd/22674957566.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_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 5044 bytes
SHA-256: f3549fd40c0081a8d34a89ad07d839823b99b1eb90a2cdec69fdab6e22ff34d8
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 11660 bytes
SHA-256: 31e3eb2b7b323a899772531fc0c18fe4750c1818b3e1bb0d41d7d5fc471a01cf

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