Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26fde48aa25c2ad…

MALICIOUS

PDF

78.4 KB Created: 2021-06-07 06:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fcd101356411ec33f6034a4ccfc7e693 SHA-1: 65617939c3f3da8b3ecbc089cea0787ef2502e5f SHA-256: c26fde48aa25c2ad21a4fcb56f3d33a99f188b736fb286e4de21eeb5bd3a50f2
194 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious files. The presence of a download button lure and ClamAV detection further supports a malicious classification. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://crysiq.ru/pbw?utm_term=epson+l130+adjustment+program+free+download+full+version PDF link annotation
    • https://gijagexerifaru.weebly.com/uploads/1/3/5/3/135322880/3079231.pdfIn PDF document text
    • https://bonawoxe.weebly.com/uploads/1/3/3/9/133986387/66e43bf1af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_60564f54336ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405195/normal_5fde8f8b22ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_605031c22a818.pdfIn PDF document text
    • https://jotabaputeja.weebly.com/uploads/1/3/5/3/135350690/9446812.pdfIn PDF document text
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/dufis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5fda834f73bab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_60b96b35775b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_6041777440b46.pdfIn PDF document text
    • https://deminoki.weebly.com/uploads/1/3/5/3/135310913/12ca2ed39e347.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3b7036-5bbc-4907-9d45-779124227176/how_to_check_anna_university_certificate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d8e348-f947-4725-a080-2f0cf2a877e0/50879597552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a7e27e7-18c0-4a73-9403-f950cd3d81cd/vezuzudoturujuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82dd81a-c087-4d09-9c36-ad2eff45f726/2013_chevy_malibu_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dcdfdf-edfb-4284-927d-66f08d160919/lagewegujokexatafaxenino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda288dd-83ea-4689-9862-b3e5d0083ac5/vovozeledezudotilas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/693ea1be-0f62-4953-8f7e-68ce4850a29f/is_bose_cd_player_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ad12351-c33c-4c93-9531-66eb800fdc36/56375044139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3561fbf-acdc-4020-b910-69b3d806827a/86049039117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/831aaf12-93ab-49ea-ad42-b3eb9c4d996a/poeta_en_nueva_york_poemas_destacados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c053f021-7b30-4746-8b1e-856997a158e0/shark_navigator_lift_away_vacuum_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dcca106-48c7-45f2-b72e-977063dfc5d2/richland_township_cambria_county_pa_zoning_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/499cb63e-0810-4b1c-8c76-4cf2e25c7ab2/xetemolukevurepo.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_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 5904 bytes
SHA-256: 19e2e11363eab484b663a254a6a65799c0b7236b084c53a276ddb0732756edd4
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 11188 bytes
SHA-256: d0ca6d9cebcb02e5a75d733e10ed688dbd3038e5211e805437b213d602efff6f