Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0920a1780b05242…

MALICIOUS

PDF

80.4 KB Created: 2021-03-14 00:18:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af654bddc3e71ce5387ee34145572908 SHA-1: d634488ff08b5d35ee5f4504ee624b3deea7faac SHA-256: f0920a1780b05242055fd7fdd19296e8514981a45be44fe36759bf09228b9ae0
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 obfuscated or lead to benign content, suggesting a link farm used for SEO poisoning or to hide malicious destinations. One of the primary external links, 'https://botokaw.ru/123?utm_term=driver+bixolon+srp+330ii', appears to be a lure for downloading a driver, which is a common tactic for malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

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-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://botokaw.ru/123?utm_term=driver+bixolon+srp+330ii
    • http://digitaltoolsfor.xyz/995041212048plhr.pdf
    • http://trenolgia.buzz/23995162343wmnrs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_2d3acaf2f35745c6b1431bf47424b808.pdf?index=true
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_c4ae6176a2c0483eb27c4dc9ae43f998.pdf?index=true
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_a54ba0c7b742464480239b3e3bcb3e28.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2a05b9d6-4b2f-4958-bfa6-68ea80c220d1/57253191582.pdf
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_d7a043a93a0a4e32b9e147a9e30c38b3.pdf?index=true
    • https://s3.amazonaws.com/xufaxoferugod/report_illegally_parked_car_brisbane.pdf
    • https://s3.amazonaws.com/gavobawum/jsonformat_set_timezone.pdf
    • https://s3.amazonaws.com/divelatoxa/bapimevixugazixeloval.pdf
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_563002eec0094435816b1288dd9084fe.pdf?index=true
    • https://s3.amazonaws.com/tetenifeme/tisavudomurirukumodamat.pdf
    • https://s3.amazonaws.com/wifiduxezo/autocad_mep_2019_manual.pdf
    • https://uploads.strikinglycdn.com/files/15fe47bc-07cb-4191-bb00-8b953f1c4028/11990519800.pdf
    • https://uploads.strikinglycdn.com/files/f1426428-78fc-44eb-9f1c-4ab16d3e7f02/92305531006.pdf
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_630ba2943a4440ad915a6db27691fd55.pdf?index=true
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_403a0eb5e7d74c7c95282f4ef46c4602.pdf?index=true
    • https://s3.amazonaws.com/pusixa/61014870401.pdf
    • https://s3.amazonaws.com/latufenaw/35007945132.pdf
    • https://s3.amazonaws.com/mogipegi/96755060710.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_b0387916623440d88a10bc22c4f8b122.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb5.bin
10f588ff3a764fbc7d28723edb5af456e4ba0dcad19142171ebe25f922fe8c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 5176 bytes
font_01_sfnt_off0000fe6f.bin
ccd804744e6ed29e95f7c01f190fe834841b16b82cd984f4ccf4f77746ccd886		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 17648 bytes

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