Malicious PDF — malware analysis report

Static analysis result for SHA-256 4571700d3b856fbc…

MALICIOUS

PDF

79.4 KB Created: 2021-03-10 13:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b55f49d0f3a4bba1c728f76852ed4f1e SHA-1: 741352041f133c0c06a6703e1d6b54a8d1a6a08a SHA-256: 4571700d3b856fbc17648dbbc7f18add5e276dcc731c64ee531d022181b70a26
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The presence of an embedded URI pointing to 'zajinet.ru' and other suspicious URLs suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'zombie catchers apk para hilesi' and 'wkhtmltopdf', indicating a lure for a game cheat or similar potentially unwanted software, which is then likely hosted at one of the extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=zombie+catchers+apk+para+hilesi
    • http://uplrezina.site/68502154541z7yzq.pdf
    • https://static.s123-cdn-static.com/uploads/4370064/normal_5ff6b83a428a7.pdf
    • https://static.s123-cdn-static.com/uploads/4387430/normal_5fe203bb4aeb3.pdf
    • https://cdn-cms.f-static.net/uploads/4414851/normal_5fe788992966c.pdf
    • http://lerob.info/wuseninomibexmol3g.pdf
    • https://static.s123-cdn-static.com/uploads/4445340/normal_5fe51676b4fd2.pdf
    • https://cdn.sqhk.co/nizufalagef/blzXVgg/megevizurujofeparuxexex.pdf
    • https://static.s123-cdn-static.com/uploads/4476750/normal_6000cbdac6777.pdf
    • https://cdn.sqhk.co/fadejiweruw/jjii4jf/tip_tap_room_gluten_free.pdf
    • https://cdn-cms.f-static.net/uploads/4460466/normal_6010def089fa2.pdf
    • http://whysmall.space/foriselete7va2k.pdf
    • https://cdn-cms.f-static.net/uploads/4372080/normal_6038fe5628e27.pdf
    • https://cdn-cms.f-static.net/uploads/4379471/normal_601bb3d268f15.pdf
    • https://cdn-cms.f-static.net/uploads/4403688/normal_5fe7025204ebe.pdf
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5fcd5317079b3.pdf
    • https://cdn.sqhk.co/lofakekaf/hcigUgi/five_nights_at_freddy_s_song_2.pdf
    • https://cdn.sqhk.co/bibikodazit/fmcaLsC/vemisi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/29f415d1-14d0-49bd-9d4e-50ce5e6400ea/ethanol_has_higher_boiling_point_than_diethyl_ether.pdf
    • https://uploads.strikinglycdn.com/files/2b986fcd-fa8d-4b81-8485-5bf2beb39e33/zepava.pdf
    • https://uploads.strikinglycdn.com/files/4beca9fa-3777-428a-83ae-06d34eb45232/pozafudu.pdf
    • https://1bccc061-d5d5-45a0-82cb-d48a2eec7d5e.filesusr.com/ugd/4d935e_0a8732dc64cb42c8b51b10d7d1684027.pdf?index=true
    • https://uploads.strikinglycdn.com/files/96927ef5-e314-4fc3-b261-5815fce7f4e1/apc_back-ups_es_750_surge_protector.pdf
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_615676a84ec34656a481afc7016ca1c5.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_off0000ec41.bin
743272e1020624d9872095d9993d3e787d466c17c6cac6eb7130d3a5e01fb605		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 5016 bytes
font_01_sfnt_off0000fd44.bin
921aa0985547f95e5b0a0d625d6fe456073e61c773d6ec4ebbf0b58d9f974e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 10788 bytes
font_02_sfnt_off000121d5.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 4324 bytes

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