Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efb9f73796834a2…

MALICIOUS

PDF

67.8 KB Created: 2021-09-26 14:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 255638ceff68aa6e4ffb6a64b432ccd7 SHA-1: 786604fd715dbdcad3d8ffaf99d81a147e339dca SHA-256: 0efb9f73796834a2f189f1efe9059fc384331232c3d3ddab9f794685dd68af69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to numerous external PDF files. The presence of multiple unknown-reputation URLs suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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://autosaloncenter.com/uploads/file/16036091198.pdf
    • http://baozhaopharma.com/upload/files/vivewol.pdf
    • http://metalzilemboeventi.com/userfiles/files/64110511933.pdf
    • http://hanasushi6.com/uploads/files/29209631168.pdf
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/bakerinifuzezeko.pdf
    • https://projektovanje.info/userfiles/file/jamofiganaka.pdf
    • http://haiqi-machine.com/d/files/81575713792.pdf
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/natixefesonesolezel.pdf
    • https://htijsr.com/userfiles/file/76535910443.pdf
    • http://skogsformedling.se/bilder_umeny/File/8218667965.pdf
    • https://sudahhabis.com/contents/files/69111097605.pdf
    • http://americasbestmanassas.com/uploads/files/80186822989.pdf
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/moxebawososix.pdf
    • http://cbestdesign.com/ckfinder/images_store/files/37229386398.pdf
    • http://china-miyaco.com/img/file/202198103630.pdf
    • http://avvocato-callegaro.it/public/file/norogejejata.pdf
    • http://wintec-samu.hu/uploads/files/tigaroxomevodepafiposir.pdf
    • http://letnipohar.cz/upload/file/valefoxenakalinuxumago.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/86942032314.pdf
    • http://ahnil.com/userData/board/file/41683185998.pdf
    • http://miminku2.com/contents/files/66257063087.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+hungry+shark+world+gems
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abf7.bin
0b4af043ae38efbb2b55fa242922085d5213d34c6a00bfa3c265259ba994f617		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABF7 10876 bytes
font_01_sfnt_off0000c4bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BF 16792 bytes
font_02_sfnt_off0000dcd1.bin
6b2c7df1bd8385e7a7bca684aec0416f9b829ecfcf7fe7d77326a7e2b5fc08ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 14812 bytes

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