Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96c8adfd4c357a6…

MALICIOUS

PDF

59.7 KB Created: 2020-12-18 16:29:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 097a0eda54f8e310b2f355bba8e4025f SHA-1: bcd588d397ee97f402feb09ae108387da20cafe5 SHA-256: b96c8adfd4c357a608d8fc8eda5c1c843938470f957c79b5d152ddc658acd0ab
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL and the heuristic 'PDF_SEO_LINK_FARM' confirm the presence of a large number of external links, with one specifically identified as a potential malware distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/strik?utm_term=nonmetals+and+metalloids+worksheet+answers PDF link annotation
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/lupevor-fonitusirivom-boxep.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/kiriba.pdfIn PDF document text
    • https://nodopotol.weebly.com/uploads/1/3/4/0/134018708/fipimav-fazalapoxilo-ginibeg.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/3856059.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/tobaridif.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/jonutawuto.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/pevuwarobuvowa/xewiwat.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc380a327a199023ac5df36/t/5fc483cee18c5c478e8c189f/1606714320320/27161610373.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd05b82c6de34c7a3a034c/1606223290457/74370333153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a25780d-d2ef-4885-98a8-412d42e446c5/spotify_premium_apk_cracked_no_root.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2bb7740-928d-4192-bef2-3618ca5c12ca/lesson_9.5_practice_b_geometry_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/xexunuvivemigapono.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_off0000ae9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9C 5188 bytes
SHA-256: 4ed3696c3f1181b14365a2dc7adb0d63b00d798a186ffbc511dbe9ac1c7b18ed
font_01_sfnt_off0000c022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC022 9920 bytes
SHA-256: 66bf6df31e95abe9944e4e71c10b8d5a09c53a9f6dbd1346786d8b037033882a

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