Malicious PDF — malware analysis report

Static analysis result for SHA-256 9112c14f00b5b83c…

MALICIOUS

PDF

74.4 KB Created: 2021-06-06 02:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d18073744f8ef6d580f0768555e0cb12 SHA-1: decc3aed622d66bfdc79403ec3c89bb2de0dce23 SHA-256: 9112c14f00b5b83c2908fc49831c5cbf0c2e650f91b5d7667b9efe2d39a4749d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://medvor.ru/pbw?utm_term=the+notebook+full+movie+online+free+123movies PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fe2ac4f21a0d.pdfIn PDF document text
    • https://migigagabigugam.weebly.com/uploads/1/3/0/7/130775968/63a2ce2ce7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466398/normal_600191ce2260a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_5fd62c7f16427.pdfIn PDF document text
    • https://kukonite.weebly.com/uploads/1/3/4/6/134611202/pubigi-faxebopun-warum.pdfIn PDF document text
    • https://belikonanobos.weebly.com/uploads/1/3/4/6/134610264/buzerigojuzimi.pdfIn PDF document text
    • https://riseriku.weebly.com/uploads/1/3/4/5/134585500/noseranoputet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_6060f14679e73.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4495240/normal_60b33601d0f5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_604f8c020aaec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490272/normal_606d3ad4025fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490129/normal_5fec4b1344030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449392/normal_60504f7d5cca3.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/1a31a5b9-fbbd-426b-808d-5f9511875fd8/welesu.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144438546/notujef.pdfIn PDF document text
    • http://matekid.pbworks.com/f/zolakuwupozejanixifebideg.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/w/file/fetch/144426807/roblox_studio_download_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deda2bee-fea1-46fa-b78d-2b0b8aeb5520/how_to_release_psoas_with_ball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb1d5a0-49cd-479b-9fe5-d7e40cd9b95d/77018334989.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_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 5360 bytes
SHA-256: c84253513a69e240f0f63f284d3d05ed50ce2302b27d674a7f9458e8f03896e9
font_01_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 10680 bytes
SHA-256: b5a764221a0b6792e695114b7f6cd3e705332f41f66764e939935463f1d24309

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