Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1d9272562db6d4…

MALICIOUS

PDF

68.1 KB Created: 2021-02-14 20:36:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 015c842973f29698a73aa423af92a527 SHA-1: c0391d99bfe7c8947081d49e1987f43528b527a7 SHA-256: bc1d9272562db6d4adb09de5bff63645073d2d74ced619a0051b5cda9d534616
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, many pointing to disposable domains and utilizing UTM parameters, suggests a link farm designed to distribute malicious content or phish users. The file's structure and the heuristics fired strongly indicate it's part of a campaign to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://druttle.ru/123?utm_term=freddy%2527s+steakburgers+lincoln+ne PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410679/normal_60182f89012a6.pdfIn PDF document text
    • http://1xbet-regi.site/saxekaknc8d2.pdfIn PDF document text
    • http://legendarycraft.ru/13577644166uv0ac.pdfIn PDF document text
    • http://shtancircul.site/chrome_for_windows_server_2019bang1.pdfIn PDF document text
    • http://detonic-italia.website/pacific_navy_fighter_commander_edition_pcm5sv7.pdfIn PDF document text
    • https://funitaba.weebly.com/uploads/1/3/1/3/131380773/ccb20682d99b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377647/normal_60068e1c951d0.pdfIn PDF document text
    • http://priz24.site/bullhorn_peoplenet_timesheet3mdgq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417213/normal_6006f29c3104c.pdfIn PDF document text
    • http://probmaka.tech/animales_vertebrados_ejerciciosig6xp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_60262aa1f0901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_60295886ae561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_601f043f5d034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488339/normal_5fd12b18bceb3.pdfIn PDF document text
    • http://reduslim-europa.site/gagivofitegokonoxituqdtc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_600fa2677abe8.pdfIn PDF document text
    • http://meriline.store/govovifudfa4.pdfIn PDF document text
    • http://mon-cmso.best/ecb_coach_session_planner_template117s2.pdfIn PDF document text
    • http://helpcontactform.com/xijafiretewefinukinijidelz8se.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF2 5400 bytes
SHA-256: 418def588b1f23e17f9ac75ca79650b777949b4ee43547ae6c979ebbcf4ec233
font_01_sfnt_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 10124 bytes
SHA-256: 64249548a5c3e024432bc3f7d5bcdf6255744343145849206cc073004ff066c1

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