Malicious PDF — malware analysis report

Static analysis result for SHA-256 386c8ba7ffce268b…

MALICIOUS

PDF

76.1 KB Created: 2021-06-09 16:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: edb0fbe0ce5eff809b7329a5708b58e0 SHA-1: cff569b49831a48c1643c09789dc8db9ef80175e SHA-256: 386c8ba7ffce268b0386c87264126494253b3f0685f9ffcbab4fc258ecd806c0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. Several heuristics indicate this is a malicious SEO tactic or a distribution mechanism for other malware. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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://oniceh.ru/pbw?utm_term=warriors+darkness+within+free+pdf PDF link annotation
    • https://vebazefi.weebly.com/uploads/1/3/4/0/134040586/mujovasupoputakepe.pdfIn PDF document text
    • https://powufekati.weebly.com/uploads/1/3/4/0/134012492/laxuvidamaz-legavokubive-koxoxilovifileg.pdfIn PDF document text
    • https://lodovanu.weebly.com/uploads/1/3/4/4/134403978/4740914.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/gexoxur_bezakezajotud_lemotozaroki.pdfIn PDF document text
    • https://senamevab.weebly.com/uploads/1/3/4/6/134689233/modabar_zenawomubaregar_xomixeb.pdfIn PDF document text
    • https://dulowufokupi.weebly.com/uploads/1/3/4/4/134495444/e44100d54b016.pdfIn PDF document text
    • https://sufunawad.weebly.com/uploads/1/3/7/5/137503422/c990d.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/f8b4d2fb-d9d2-4a0b-adf2-d4320f819b07/43977925453.pdfIn PDF document text
    • http://nikekuva.pbworks.com/f/76644075831.pdfIn PDF document text
    • http://panuduxeruv.pbworks.com/f/ridepepupofofuwunupiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c646669-5b1b-4f91-9d2e-0dfbd3647d3b/45480213179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/357afeba-1cf6-473a-9ddd-15469aab9794/91201740320.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144733725/masezoxadiraxalo.pdfIn PDF document text
    • http://tovovojufa.pbworks.com/w/file/fetch/144913905/90005148176.pdfIn PDF document text
    • http://juvozato.pbworks.com/w/file/fetch/144953112/journeys_out_of_the_body_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4463ed8a-ebcf-44ff-b406-eb745394e2d1/history_channel_salem_witch_trials_video_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1d4b8a-5de6-4359-94cf-d4b45a39ea07/james_legge_confucius_analects.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/bleach_brave_souls_lvl_200_guide.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_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 5264 bytes
SHA-256: f904e9bbebe24952efef79da1105f6629f7511cbbf86139f7286e1333a4afa57
font_01_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 11348 bytes
SHA-256: 08c0dc0130efb4a16d817877b3b384562a84dc3287571a80cc44ea37da3d6a46

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