Malicious PDF — malware analysis report

Static analysis result for SHA-256 7564da9df186da62…

MALICIOUS

PDF

77.6 KB Created: 2021-03-08 07:36:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38819859b3ce52e97d7f904855b6bc99 SHA-1: d57f15fc90c63c41e6bd0b12a4817ff526d4547c SHA-256: 7564da9df186da626768b47276db692e9481188156042e64b3e9b9e2c6a5e40c
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm pointing to external URLs, with one notable URL being 'https://zajinet.ru/wix?keyword=cheat+dragon+city+2020+pc'. This URL, combined with the ClamAV detection of 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to game cheats, reinforcing the lure. No scripts were extracted, but the presence of external links and the phishing detection indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=cheat+dragon+city+2020+pc
    • https://cdn.sqhk.co/jidulopavoji/Ute2ggd/latest_liverpool_fc_transfer_news_now.pdf
    • https://cdn.sqhk.co/mivuxakadu/C6nduij/penalty_kick_movie_trailer.pdf
    • https://cdn-cms.f-static.net/uploads/4452593/normal_6027993cc7a41.pdf
    • https://cdn-cms.f-static.net/uploads/4475992/normal_603ff050c6b8b.pdf
    • https://cdn-cms.f-static.net/uploads/4376101/normal_601b1cca6ce20.pdf
    • https://static.s123-cdn-static.com/uploads/4460725/normal_5feb617243c75.pdf
    • https://cdn-cms.f-static.net/uploads/4408990/normal_603a13b043f42.pdf
    • https://cdn.sqhk.co/kawonidoza/RZjedSM/wedejixemibetapoxuwefes.pdf
    • https://cdn.sqhk.co/xawemubimaj/7jGNbge/one_year_calendar_2020_template.pdf
    • https://cdn-cms.f-static.net/uploads/4366987/normal_602b098c77fdc.pdf
    • https://cdn-cms.f-static.net/uploads/4421770/normal_602f6ecf3c5f3.pdf
    • https://cdn-cms.f-static.net/uploads/4415519/normal_60134d0d75869.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fcfcf004-3a45-494c-abf9-2ad9c3aa5849/3th_grade_reading_comprehension_worksheets_multiple_choice.pdf
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_1ecda083a0144db4bbb2bccbe54665dd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2622fe89-1d91-4777-b056-f43362f853cd/kenmore_elite_washer_model_110_lid_switch.pdf
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_d79937df6ef34de594a853661d53283a.pdf?index=true
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_bb8c5459a7a84180a082ea1fc6d65cce.pdf?index=true
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_47394ea2e5314ecfaff8a64e728c4dac.pdf?index=true
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_7255fcbcb38043e794e7c9e2aff4a4a9.pdf?index=true
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_a97af1891ec5485581e4cbd5e7ed2d07.pdf?index=true
    • https://uploads.strikinglycdn.com/files/88324e1e-a0b8-4206-9d41-dd6f39a0c238/how_to_create_wordpress_website_in_hindi.pdf
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_e67d3f4311cb4981b68acb595f89f77f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a6d1147-d501-4a07-8a4c-1e6a5b958ea4/troy_bilt_horse_tiller_pto_attachments.pdf
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_1daefff56a2241d0a81b4c1ecc27edba.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e819.bin
d1c5a20b10d6a2958f5d8da56915d77780883bc1dd1cad831094765bb45ce23f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 5404 bytes
font_01_sfnt_off0000fa74.bin
5afdba97a9db781fa31574745fe6469589a9ed42fb775824320e09596867020e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 2468 bytes
font_02_sfnt_off000105a4.bin
118885b2caf553fa1397c36cb57adf99be59435281735ac9c8393ba08431c6f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 10156 bytes