Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfcda5d22a25d89…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 02:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11403276e63361e503a1ed890572e3e5 SHA-1: b2a8d36302d29f328f55349568269d3b00c02a91 SHA-256: acfcda5d22a25d8969862eaad63751a4de9bc7bda1d1a3e495ac8d06aadf03f7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it presents as an image to hide a clickable action, likely directing users to one of the numerous embedded URLs. The presence of multiple disposable domains and UTM parameters suggests a campaign focused on redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=how+to+change+china+phone+os+to+android
    • http://datavincity.com/uploads/ckfinder/files/rigobufiteronufurutobis.pdf
    • http://manpukulivermore.com/uploads/files/61029075158.pdf
    • http://dydlhx.com/upfiles/file///25703788459.pdf
    • http://ustunongel.com/image/files/pukumukodosawiwoposin.pdf
    • https://e-motorcycle.tw/upload/emotorcycle/files/9931241033.pdf
    • https://mimpishio1bet.com/contents/files/pulogimekikovigaganalawe.pdf
    • http://rebeccaosborne.com/uploads/9482130453.pdf
    • http://www.moyekolodin.com/files/9370592577.pdf
    • http://pedraferro.com/files/files/45118977440.pdf
    • https://alicantea.centralcms.cloud/galeria/files/1241159749.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb6c4a491---gokal.pdf
    • http://apcmagon.com/userfiles/8669687761.pdf
    • http://worldcastlive.com/userfiles/file/nenuregisigim.pdf
    • https://alatheir.com/atheirwsfiles/file/pogesele.pdf
    • http://lmleadmanagement.com/userfiles/files/24278184947.pdf
    • http://warehousetraining.ie/images/76274374479.pdf
    • http://venkateshservices.com/uploads/ganuripen.pdf
    • http://vitacanes.com/uploads/files/72206239918.pdf
    • http://marymo.ru/uploads/files/77021698109.pdf
    • http://giadinhlaurenso.org/upload/files/42244155151.pdf
    • http://tayles.com/uploaded/84354826814.pdf
    • https://gplacestracker.com/userfiles/file/75895460769.pdf
    • http://brandiassociati.it/userfiles/file/64294921390.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4924d1708bd2c42342947156645d9b33/bugapib.pdf
    • 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_off0000ad5c.bin
41e7800277b97341b4e0ef0e0fc9e3bee5f660c0bdddd22631212eadabcfd3fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5C 14472 bytes
font_01_sfnt_off0000d154.bin
ee758c87881f25c33bd43a89f95bb38764baca1c9bbd99689524dc7c2c601a18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD154 10824 bytes
font_02_sfnt_off0000ea14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 16792 bytes

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