Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a22cf3c34b76360…

MALICIOUS

PDF

69.9 KB Created: 2021-09-13 10:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a6ed59c320e45ca6001985f8ee8bebfc SHA-1: 7be71c636c3ac4c2f8a1ccc92827a12114faaf9d SHA-256: 8a22cf3c34b76360a2d6c67d5261dc1f929431442f4e4d0b9a664b458f40e367
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF also includes numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm, further indicating a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://pixomot.ru/uplcv?utm_term=types+of+graph+curves PDF link annotation
    • http://lpxs168.com/filespath/files/20210904095308.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/60051973623.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/dusafabipufelosabixide.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/23552365769.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/92720339316.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/wikuwanuvek.pdfIn PDF document text
    • https://termoformat.md/img/files/tirulikimoxiragapivofok.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/diwarapuva.pdfIn PDF document text
    • https://brukspec.pl/upload/file/zavis.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/pufateminovonakar.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/tesokafupone.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/ladatapusozoz.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/80345091501.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/toxomaruzaxelide.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/37345148633.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090407141888.pdfIn PDF document text
    • https://ccskin.com/geektic/files/72108087104.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109030148223422.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/dadesarodo.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/18235793735.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/roxetutuga.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210912081337_764980261.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/82098717800.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22A 15320 bytes
SHA-256: bfe60b87c873c1e24c120ef9afa3e8190a61e1e48e6ff84b8b7c5e7114f796a2
font_01_sfnt_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 10664 bytes
SHA-256: 8d358355cce3008296fc358cd7bf243cb3bf4f8a843337b070c714131f3939f7

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