Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d16e5ed7f0b2a2…

MALICIOUS

PDF

77.6 KB Created: 2021-03-13 17:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 46d86418c4eb65ca19192ce8e66082bf SHA-1: e5bdeef6100df142c54a89ef7564ab4bd7904d2b SHA-256: 36d16e5ed7f0b2a2b5429e3166c55a188bf0ab393fc8252e5a4d3f7c41b875a1
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it functions as a link farm and hosts suspicious links, with one heuristic specifically flagging an invisible link to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous external URIs points towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://botokaw.ru/wix?keyword=physics+chapter+2+standardized+test+practice+answers PDF link annotation
    • http://icily.xyz/darth_vader_song_sheet_musics05au.pdfIn PDF document text
    • http://thepropheticapp.com/the_best_cartoon_videow412j.pdfIn PDF document text
    • http://govajidenemases.22web.org/surizan.pdfIn PDF document text
    • http://jobauthor.online/it_recruiter_interview_questions_and_answers_for_freshers7h1dx.pdfIn PDF document text
    • http://sokelekife.iblogger.org/sezabozepakimukuxizemiser.pdfIn PDF document text
    • http://policyhelpcenter.com/fenomenolojik_aratrma_nasl_yaplrxe5rl.pdfIn PDF document text
    • http://bluhgang.best/93358459522vq1sz.pdfIn PDF document text
    • http://com-login8.xyz/vobiwofugasizagoxilcyug.pdfIn PDF document text
    • http://mp4.design/670367234307tm2c.pdfIn PDF document text
    • http://sevastopol.sale/acurite_digital_indoor_outdoor_wireless_thermometer_00380w_with_daily_high_loww2ojc.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/tejuvonixag/domapumo.pdfIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_93abe8dd1b9e4b80a95103b1ed7491d9.pdf?index=trueIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_dcc74a1a106841b2924437ad12bc7bc9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/gilumupaterowurono.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/paradiso_perduto_milton.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/tigeredarareborusomisiji.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_408228226692480ca2226eef48f72fa9.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_d839cc5ade7b466794e6f4dc2c62cba6.pdf?index=trueIn PDF document text
    • http://levapen.rf.gd/tp-link_av500_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a1c910-6e0a-45e5-8ce1-7099260905b9/how_many_views_do_you_need_to_make_money_on_tiktok.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_ddc845040e6c4ef69ab644040d96c729.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/445de7d1-e1b2-4f5e-90ba-2a949e606e9f/72019963165.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/australasian_health_facility_guidelines_in_nsw.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_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 5504 bytes
SHA-256: d087948d69916a1fb0e1099e983765877c17c978507b0a87a27fa9fbb3ea583e
font_01_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 11256 bytes
SHA-256: 1f41cdd8f869bc9e41b05173390afa94911803dbf954e42750ce2f00263565b1