Malicious PDF — malware analysis report

Static analysis result for SHA-256 876d5fcfc376eea1…

MALICIOUS

PDF

88.2 KB Created: 2021-04-03 21:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8c927ffb40ec7f742aa5455c523170da SHA-1: ed3d03eaaff0929f6a7c5ed6fe139f422ea44497 SHA-256: 876d5fcfc376eea1fe88f78707e05d7ab5f867bee0fc6cefed6a3af062a48f33
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to link farms hosted on services like Weebly, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document, possibly leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=buoyage+system+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486035/normal_604f898a1a5cc.pdfIn PDF document text
    • https://kogababofaf.weebly.com/uploads/1/3/0/9/130969162/kanubuv.pdfIn PDF document text
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/wekumugosuvew-doluz.pdfIn PDF document text
    • https://pasojonili.weebly.com/uploads/1/3/4/1/134108831/suzemugujifif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_602018cc8ac13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5fd6854f49422.pdfIn PDF document text
    • https://jenamojid.weebly.com/uploads/1/3/1/0/131070605/1390116.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/sibow.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/jgc8sjM/76759144822.pdfIn PDF document text
    • https://cdn.sqhk.co/kojariwirip/bggwheh/78513138531.pdfIn PDF document text
    • https://togajakuro.weebly.com/uploads/1/3/1/4/131409127/supoze.pdfIn PDF document text
    • https://denibemexe.weebly.com/uploads/1/3/4/5/134597338/nifadav_bumopu.pdfIn PDF document text
    • https://cdn.sqhk.co/fejovuwov/eJggW9H/vudelunapewetu.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/simujix/winter_wonderland_sheet_music_trumpet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e12345-f066-44ad-a3d7-3b8cddeb7790/1945668118.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/which_is_better_iphone_or_android_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/kojewefijumofoxitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650ec868-fd03-473e-8e98-a63046934228/93675216871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3385dadf-be3c-4e07-919f-69b8840ca90c/xaporu.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/walking_dead_first_comic_book_value.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/practical_palmistry_narayan_dutt_shrimali.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_off00011cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 5384 bytes
SHA-256: e1f7d667aae6906995dcd58c191b7e35d970d01f8d3900e57325a1578ffd2516
font_01_sfnt_off00012f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2C 10840 bytes
SHA-256: 057650a60b66f959f43bec53b13d790a572ab35b15584e34142245f647f5299f

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