Malicious PDF — malware analysis report

Static analysis result for SHA-256 9350373cf81e1b62…

MALICIOUS

PDF

79.9 KB Created: 2021-03-27 15:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec1ad121b6cd28d5538e14ad83dbae3f SHA-1: 01bb97e7e27cd472b910110c299787351812529b SHA-256: 9350373cf81e1b62c7d39945ec7674adddc529a7a822bdaf299a63ece32e55d9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign PDFs, suggesting a link farm or SEO spamming operation. One URL, 'https://druttle.ru/wix?keyword=braeburn+5000+thermostat+troubleshooting', is flagged as unknown reputation, and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' indicates a phishing or trojanized PDF. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=braeburn+5000+thermostat+troubleshooting
    • https://static.s123-cdn-static.com/uploads/4420431/normal_5fc69549b096f.pdf
    • https://sibuzowad.weebly.com/uploads/1/3/2/8/132814892/sinetasojorewerak.pdf
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/7aa8c76859e7.pdf
    • https://cdn-cms.f-static.net/uploads/4418567/normal_5fd645020a2b5.pdf
    • https://cdn-cms.f-static.net/uploads/4420907/normal_60520c5d2a092.pdf
    • https://cdn-cms.f-static.net/uploads/4380405/normal_602b9dc9ea50f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/banula/24231360044.pdf
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_78f425c1178643479f669f8477cd9c49.pdf?index=true
    • https://s3.amazonaws.com/sugosubexez/atwood_rv_water_heater_g6a-6e.pdf
    • https://s3.amazonaws.com/xoferuzu/79337231314.pdf
    • https://s3.amazonaws.com/mixanaz/biodata_for_marriage_format_for_girl.pdf
    • https://s3.amazonaws.com/towutoginadivu/photoshop_shortcut_keys_cs6.pdf
    • https://dd3a609d-fcd9-461e-ae06-f7e9ec6f332d.filesusr.com/ugd/811c3f_6c301e42c7eb4cacac8fab4110a7aae6.pdf?index=true
    • https://s3.amazonaws.com/wegemebufojafak/30837266219.pdf
    • https://s3.amazonaws.com/jojitagifuva/39847368109.pdf
    • https://s3.amazonaws.com/gagotaniwipure/kudek.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/panimudoreropeliwotobino.pdf
    • https://s3.amazonaws.com/julaxel/zesawevalowikakuxu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebef.bin
94261352cdeaf50781b93f5f04da846d30940bf81b0bb1062c8ae022b1ceabd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 5436 bytes
font_01_sfnt_off0000fe3a.bin
13ab608ea8b74b79efd04e59d3e49425f45448b501635ca493225fb35d62085d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 11320 bytes
font_02_sfnt_off00012430.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12430 4324 bytes

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