Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8519d59e5727f4…

MALICIOUS

PDF

77.2 KB Created: 2021-03-24 15:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e40177e1856c40b1b0189df6fe4ad587 SHA-1: dc091082c179fccf04c3c104cb687c33554f7677 SHA-256: 3a8519d59e5727f4331415dd66341c2507f864ec24a3e9ed7d976481ce53fa90
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The ClamAV detection and ML classifier also indicate maliciousness, with the ClamAV signature suggesting a phishing or trojan component. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or content-luring tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/wix?keyword=pterocarpus+marsupium+extract
    • https://cdn-cms.f-static.net/uploads/4379970/normal_60152a0e96bbf.pdf
    • http://afracheat5.xyz/97552126154wfmlj.pdf
    • https://kavejujutafen.weebly.com/uploads/1/3/6/0/136022690/4101535.pdf
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/vesuroxojorelidire.pdf
    • https://cdn-cms.f-static.net/uploads/4377912/normal_601e579f44033.pdf
    • http://mif-smeh.space/sony_xplod_amp_1000w_pricefj3f0.pdf
    • http://clubstore.info/27373502679nmikz.pdf
    • https://static.s123-cdn-static.com/uploads/4498986/normal_5fee182de8ec1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tibanepoxilibud/wotijizovo.pdf
    • http://tafisom.epizy.com/anime_battle_2._2.pdf
    • http://pebotavafusu.epizy.com/78923631879.pdf
    • https://s3.amazonaws.com/fajonubinomeder/molecular_visions_model_kit_instructions.pdf
    • https://s3.amazonaws.com/ninasivol/mastrena_espresso_machine_starbucks_price.pdf
    • https://s3.amazonaws.com/dojivewobasuval/how_much_electricity_does_a_delonghi_oil_filled_heater_use.pdf
    • http://morovewonapulaj.rf.gd/jiwugejexedubilu.pdf
    • https://s3.amazonaws.com/gapivegek/36179617567.pdf
    • https://s3.amazonaws.com/toguvaju/common_core_state_standards_math.pdf
    • https://s3.amazonaws.com/nitizobuv/diversity_and_inclusion_objectives_examples.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_off0000ee83.bin
e4190fb2fa42ca7addbcaa0b3fbf35c4985c5a6a10bcae35ced53bf2b87799ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 5116 bytes
font_01_sfnt_off0000ffd6.bin
151224a842327e98561021e32bbddc04b6113a4d6fe497e3734e9b4dde869a05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 11224 bytes

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