Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c959619d26c8d9…

MALICIOUS

PDF

96.8 KB Created: 2021-03-22 08:09:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e799dfd73df2a79474f3369ba20ab367 SHA-1: 457fb528f045cabb05b13dc2e38d3786663cd104 SHA-256: 12c959619d26c8d9eba59fd4444de6a54faaa9dacc33e82d3c9de7ad81f8d73e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://pelibifir.ru/strik?utm_term=on+course+study+skills+plus+3rd+edition+pdf+free PDF link annotation
    • https://povitopol.weebly.com/uploads/1/3/4/6/134648875/1a9d272a14e.pdfIn PDF document text
    • https://xezorilim.weebly.com/uploads/1/3/4/5/134588859/divepojesorul_rudojuxulin_zovirevazoparu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5fc732fd2578a.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/gevejepi_dukemasoka_dajota.pdfIn PDF document text
    • http://genoray.pro/39276854145fc346.pdfIn PDF document text
    • http://pamuxixa.iblogger.org/crown_of_thorns_starfish_lifespan.pdfIn PDF document text
    • http://manaxupupili.iblogger.org/sample_agenda_and_minutes_templates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368492/normal_6009a4509b5e5.pdfIn PDF document text
    • http://blog-millionaire.buzz/gixadewenukelefuvez3c6gf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_601b27f719329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_603529a7a1ccb.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/fujadabez/battery_charger_circuit.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/lopimuvobujiv.pdfIn PDF document text
    • http://kotidaw.epizy.com/lightroom_presets_pack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/brussels_midi_station_platform_map.pdfIn PDF document text
    • http://jewuwururutaf.epizy.com/california_dmv_forms_title_transfer.pdfIn PDF document text
    • http://suginutowukig.rf.gd/derarufowe.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/59452048377.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/bodybuilding_motivation_videos_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/ffiec_guidelines_charge_off.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/lusivimodakimovu.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_off00013a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1A 5296 bytes
SHA-256: 4c3ee1e86456de7ccdba29161e6d247f9518d045960ad1c70611f39579e21a38
font_01_sfnt_off00014c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3C 12384 bytes
SHA-256: c81b971306c655def59209349376799afddf8983a8ae04aa82c68edf76a49e2e

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