Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c72ab2ab823fb49…

MALICIOUS

PDF

79.1 KB Created: 2021-06-01 06:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77f5878dfa6f056a51f6f40446d135ee SHA-1: 09546fa3ddb3a3b8a6ec29967aafe97cd66e58ef SHA-256: 9c72ab2ab823fb49d592724b814dba8453247233aff63f611ab9d45b7b02da46
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 it as a link farm. The primary malicious URL, 'https://ketchas.ru/pbw?utm_term=exerc%25C3%25ADcios+sobre+pronomes+para+6o+ano', and a secondary link farm URL 'https://metiwefipit.weebly.com/uploads/1/3/1/4/131406934/3ad3060dbc.pdf' suggest a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/pbw?utm_term=exerc%25C3%25ADcios+sobre+pronomes+para+6o+ano
    • https://metiwefipit.weebly.com/uploads/1/3/1/4/131406934/3ad3060dbc.pdf
    • https://static.s123-cdn-static.com/uploads/4387040/normal_600504413b39a.pdf
    • https://static.s123-cdn-static.com/uploads/4424029/normal_6008f9c3d432b.pdf
    • https://static.s123-cdn-static-d.com/uploads/4420476/normal_60aff3311047f.pdf
    • https://cdn-cms.f-static.net/uploads/4472204/normal_606d55d4829d8.pdf
    • https://cdn-cms.f-static.net/uploads/4484818/normal_5fd6ecea4939f.pdf
    • https://nurowilalivep.weebly.com/uploads/1/3/1/3/131380447/zudug.pdf
    • https://cdn-cms.f-static.net/uploads/4420018/normal_602ee5090075a.pdf
    • https://cdn-cms.f-static.net/uploads/4382965/normal_602b3a879bb3f.pdf
    • https://cdn-cms.f-static.net/uploads/4476434/normal_601bca9f2be4e.pdf
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5fd61e40714f0.pdf
    • https://defuboxuzunusam.weebly.com/uploads/1/3/3/9/133986960/mozenaxer-taxidom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a60e221a-5ed2-4501-9537-6c59e64fd323/2877290697.pdf
    • https://uploads.strikinglycdn.com/files/464b737f-ed44-44e9-b756-3624517b6009/armitron_40_8417_set_time.pdf
    • https://uploads.strikinglycdn.com/files/a70e0e1e-41cb-416a-aae6-196024f5a82f/lojoti.pdf
    • https://uploads.strikinglycdn.com/files/1466c5df-5cf0-4b5d-a8bd-546d3574a0b6/rockwell_versacut_4a_3-3_8-in_mini_circular_saw.pdf
    • https://uploads.strikinglycdn.com/files/58f31296-c5f9-42ae-b00b-67f9eb8f1e09/tasaf.pdf
    • https://uploads.strikinglycdn.com/files/3e3475a4-5c2d-451f-89e4-caba3d987b7f/bipowuximabolobi.pdf
    • https://uploads.strikinglycdn.com/files/28941903-2d41-4c97-8c59-3f323afa92c2/vebawafewisiroxiwokemax.pdf
    • https://uploads.strikinglycdn.com/files/c0243ad3-2c22-4719-8d45-44bfbcdad74f/wobesegaxotu.pdf
    • https://uploads.strikinglycdn.com/files/18bd1f8f-b20b-4cdc-bb91-cb7de1f7f584/armstrong_unit_heater_flame_sensor.pdf
    • https://uploads.strikinglycdn.com/files/a41953a8-8cb5-4bb5-864d-f91079aa84bf/16793797285.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25a.bin
e69adf52893e01cc4fb18024a7de878797bfdb200f3c9bb15c5bb52d53df01cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 5420 bytes
font_01_sfnt_off000104bd.bin
74dbfd0e35b265afb7370527eda3c35b36cdf01cb0157fab25fde1b901947c24
pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 13040 bytes