Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd0a239560520f4…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 04:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed2e532d654c1b99931540f52904ba8f SHA-1: 6d70520f3adc132107871fc93e1b73ff3d139855 SHA-256: abd0a239560520f4209cb148635d077a6f3d6022f38934c32b1686e85a7fb28e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO purposes, likely to obscure the true malicious intent. The ML classifier and ClamAV detection strongly suggest malicious activity, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/xujoxasen.pdf
    • http://files.ibiza-ferien.de/file/69334441614.pdf
    • https://rajakeempat.com/contents/files/59566392700.pdf
    • http://ez-surveying.com/htdocs/cljr/data/files/wiwom.pdf
    • https://xn--pssa17sw71b.tw/upimages/files/rirevubimigazadibuwot.pdf
    • http://www.awakohchang.com/image/upload/File/ifulanunavukuriwobanak.pdf
    • http://kadh.kr/bobod/upload/file/8736925325.pdf
    • http://ciskmv.com/css/file/nesozubatotabetejomod.pdf
    • https://iwistw.com/upload/files/44328177522.pdf
    • http://nanoservice.cz/upload/file/wekawunuvokakipimena.pdf
    • http://cameragiaminh.com/upload/files/5275999009.pdf
    • https://wecareu.net/ckfinder/userfiles/files/15906308159.pdf
    • http://jonme.net/ckupload/files/33580199954.pdf
    • https://agrando.cz/files/file/46210742982.pdf
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/86832671423.pdf
    • http://jrpst.pl/userfiles/file/finofig.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/31fb3377bc6c6e531afad63938142c2c/kemisipisapuxazi.pdf
    • http://terralis.eu/catalogue_dynamique/file/96206513967.pdf
    • http://maivietnamesecotati.com/uploads/files/zumobavo.pdf
    • https://liftsystems.ro/LiftFiles/file/melixizifobekanazazudoxo.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/89127550637.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/99413009860.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gta+lcs+cheater+apk+for+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6bb.bin
1a30bcac100e35dc9e7525c0c033fc8d0bb3ae7afc156dc60c676a5f33a0957e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BB 10848 bytes
font_01_sfnt_off0000dfb7.bin
0feefb448ca76a5849fd2e15150c3d9223c9d9ad3b9423b74ab6ee7b1fa67bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 20868 bytes
font_02_sfnt_off000114ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 16792 bytes
font_03_sfnt_off00012cbc.bin
126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBC 16192 bytes

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