Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12ec33df26695c6…

MALICIOUS

PDF

72.1 KB Created: 2021-03-28 12:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 11efe90d61a83258dd13c94abfbc4418 SHA-1: 5d53bb7091bd01ee16d69ae800e03f1eb76f6ba4 SHA-256: f12ec33df26695c6f54b8fbf693cac48bfc86447b65aca4db20df5f093a6c0ca
134 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, with a high concentration of links on disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a phishing attack that leverages a deceptive document body to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://nipisod.ru/award?keyword=convert+pdf+to+word+online+edit+document PDF link annotation
    • https://cdn.sqhk.co/kalazirifev/geqgem8/bein_sports_connect_nz_price.pdfIn PDF document text
    • https://cdn.sqhk.co/toxotunem/HiiThc1/evolution_film_2001_streaming_ita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_60241b2ee2d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_60104b5b41519.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367920/normal_5fdd46a0888a2.pdfIn PDF document text
    • https://cdn.sqhk.co/gegatuzikat/iew3BpH/29121752423.pdfIn PDF document text
    • http://cz-nitrof.website/45768512872d8omu.pdfIn PDF document text
    • http://kogovokuriboti.22web.org/bengali_movie_mandira_video_song.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/iv7hggd/collocations_with_have_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403271/normal_5fe43664a496d.pdfIn PDF document text
    • https://cdn.sqhk.co/bojexisebiwi/jGjicif/duplicity_on_a_sentence.pdfIn PDF document text
    • http://azakalaza3.xyz/31569467518u0via.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_60347b3112136.pdfIn PDF document text
    • http://xipanekoxejup.iblogger.org/89135770386.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/sazixipame/11878690678.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/wevipigopovipavakamile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38eb6d3d-0cb7-458a-855e-9cc935e4bd33/78383700783.pdfIn PDF document text
    • http://xanijidul.epizy.com/26649325335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b83329-b5df-4434-8360-bdca02b65a4a/37702322617.pdfIn PDF document text
    • http://gevitejivojo.rf.gd/41217204341.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/can_you_program_directv_remote_to_dvd_player.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_off0000dea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 4972 bytes
SHA-256: c995247a6e8b9ca73b78269cd29a0c08d7a905d21cd09f53c39e6be7f0a78d86
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 10328 bytes
SHA-256: e0087becec9582e286d9bee3161d37eef32f298f347b7c3690a32258a8328b4d

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