Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf395e21dfc088e…

MALICIOUS

PDF

105.0 KB Created: 2021-03-14 23:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed2cf6a2af1211f6b9e38f1a44ab2870 SHA-1: 6434070a98e1dc7ab52509ccc4f18ec40bbd644a SHA-256: aaf395e21dfc088e881f53feecc94ef5db20a4e78aaaa72c94a8d4fc93a2baa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to a suspicious domain (xezojetit.ru). ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create deceptive documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=piano+man+lyrics+youtube
    • https://telixezudaridif.weebly.com/uploads/1/3/0/7/130775339/xuwulu.pdf
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/ba2eb1.pdf
    • https://cdn-cms.f-static.net/uploads/4413019/normal_5fd6aa5411426.pdf
    • https://static.s123-cdn-static.com/uploads/4366336/normal_5ff239a6167e3.pdf
    • https://cdn-cms.f-static.net/uploads/4428045/normal_602caea73d1c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/domegagowevag/33124178113.pdf
    • https://s3.amazonaws.com/voxulija/kasopizijaf.pdf
    • https://uploads.strikinglycdn.com/files/1c2525e1-8627-4bd0-9539-3f556fb4a548/pathfinder_2e_dm_cheat_sheet.pdf
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_3acc8033b94d4dc2a8981bb8d91064fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/96c09272-09a9-4e4a-8168-87781b68021f/18854602558.pdf
    • https://s3.amazonaws.com/lepefi/risutilobo.pdf
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_96476d17e93440009d13e453859ddcfe.pdf?index=true
    • https://s3.amazonaws.com/bulikowexunepov/jifiwedizevaragami.pdf
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_955617e96ecf47839d14ad5d7fad23cc.pdf?index=true
    • https://s3.amazonaws.com/povelenavuviw/bixasovexitakub.pdf
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_e10510cf5e3a4d0a8e9bbb1318b27d89.pdf?index=true
    • https://s3.amazonaws.com/vabemavuputenif/88282076972.pdf
    • https://s3.amazonaws.com/tawovojo/kelunuvafi.pdf
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_3c28c0252e0e4baabed80554c4921b1d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/12df5e0b-950d-415a-95cc-6e4034e9e274/automated_storage_and_retrieval_system_ppt.pdf
    • https://uploads.strikinglycdn.com/files/dc5387e3-d897-447a-b024-a123524ae855/what_type_of_crime_is_inchoate.pdf
    • https://s3.amazonaws.com/didowugorokirug/80958560551.pdf
    • https://s3.amazonaws.com/neporezofov/fotirozepiva.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ae2.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 6744 bytes
font_01_sfnt_off00012b98.bin
d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B98 2952 bytes
font_02_sfnt_off00013626.bin
3c316653f28b78f50a54d2f9b296189f3bbf5e8f0b0e54ea6124c7486ab52831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13626 5068 bytes
font_03_sfnt_off00014746.bin
6f7458aa65b9e344477005e254b4fccee7127538d7fa91cad6f0b8139bcfa94d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14746 13000 bytes
font_04_sfnt_off00017295.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17295 16060 bytes
font_05_sfnt_off0001872d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1872D 4324 bytes

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