Malicious PDF — malware analysis report

Static analysis result for SHA-256 add8fb529d47fd52…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 19:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b717b424c6719148bb7ceb2f87f50b6 SHA-1: 5cd2a9ec0cb873d024d2196939a53d3e417c75f5 SHA-256: add8fb529d47fd52f5230e81e9cdb8568d25d8f00e4bfb3be0456e1602644b48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, though obfuscated, are consistent with attempts to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ever.dacola.com/upload/files/pikurunusuwisi.pdf
    • http://autosoftware.company/autoresponders_images/files/kizujosurilidas.pdf
    • https://tspinstruments.com/cache/fck_files/file/90795263996.pdf
    • http://ucg-eg.com/userfiles/file/11395065349.pdf
    • http://fcgo.tw/uploadpic/files/takegivomijuzaguveme.pdf
    • http://juentai.com/userfiles/files/govigesuzegovonufu.pdf
    • http://webinaris.eu/ckfinder/userfiles/publics/files/rusuninezezamazugemo.pdf
    • http://snbedu.com/uploadfile/file///2021092917333556.pdf
    • http://bdsductri.com/upload/files/57771872217.pdf
    • https://yodobashi-church.com/47017018379.pdf
    • http://opusbiz.kr/data/editor/file/200779311761332b7e067f0.pdf
    • https://intekcanada.com/ckfinder/userfiles/files/dowiludawomatik.pdf
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210903_131720.pdf
    • http://primeasset.hu/fileok/file/marukuserubafegax.pdf
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/9499304765.pdf
    • http://restauraceeverest.cz/userfiles/file/kuruwalef.pdf
    • https://sskundal.com/userfiles/file/levubinaz.pdf
    • http://milwaukee.center/userfiles/file/87093628393.pdf
    • http://dobre-jaja.com/Upload/file/sapolanizu.pdf
    • http://m2m2design.com/userfiles/zujexawugufuvizotunoxozi.pdf
    • https://digireg.at/upload/rivan.pdf
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/92962047237.pdf
    • http://webinaris.eu/ckfinder/userfiles/publics/files/41044847164.pdf
    • http://thedewakohchang.com/image/upload/File/5067875699.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=itunes+for+linux+mint
    • 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_off0000b123.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB123 16792 bytes
font_01_sfnt_off0000c93a.bin
c4ff7173a68cbfd8dd49e2756cab6c5fa97b82ab1fb395ae00da16dd9f7ccb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 10364 bytes
font_02_sfnt_off0000e0a3.bin
e35c44b674102a9e92e81e7d9fd8842e5c973542809c7e83989979020bbdac7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 14612 bytes

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