Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8c00d448137ac5…

MALICIOUS

PDF

80.7 KB Created: 2021-03-27 22:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cb0d31b4b259a6f0f7adf14afa83260 SHA-1: b9e97afca1708bd96061973b230e17fdadf6b3fd SHA-256: bc8c00d448137ac586845eb64db863bf52dcb2fb62992d9d71a0b15949f3158b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary external URI points to a suspicious domain, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=2000+subaru+outback+manual+transmission+fluid
    • https://rixexumig.weebly.com/uploads/1/3/2/6/132681576/8726782.pdf
    • https://suxavumopej.weebly.com/uploads/1/3/3/9/133999634/e80310417dc.pdf
    • https://vesokawewewavi.weebly.com/uploads/1/3/1/3/131382886/8714209.pdf
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/b3e0ce87ebfb8.pdf
    • http://bewagubidebesun.iblogger.org/scag_commercial_mowers_prices.pdf
    • https://pijolonaponezu.weebly.com/uploads/1/3/4/8/134879261/1888769.pdf
    • https://talufebadag.weebly.com/uploads/1/3/5/3/135348560/nusigij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_054ce810475b452487da2862de22a642.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5281188a-0c0c-48a9-958a-83814a84111b/xijoxazipijinew.pdf
    • https://uploads.strikinglycdn.com/files/20e1c5ad-b6fd-45ae-9598-5bfee4576feb/insinkerator_badger_15ss_parts.pdf
    • http://texokobatogu.epizy.com/agile_pm_handbook_v2.pdf
    • https://uploads.strikinglycdn.com/files/89937a73-355e-41aa-9bd1-ccea17627729/what_is_f21_on_maytag_washer.pdf
    • https://s3.amazonaws.com/satuja/65220084820.pdf
    • https://09ec27ad-13b2-4d6a-9bba-a73d40af2dac.filesusr.com/ugd/309646_b6be59b94ae648d984a000de8dd253f5.pdf?index=true
    • https://s3.amazonaws.com/masevewi/computer_processor_troubleshooting.pdf
    • https://s3.amazonaws.com/gixawetopoli/dawolu.pdf
    • https://s3.amazonaws.com/pesetufavo/what_is_a_algorithm_in_computer_science.pdf
    • https://uploads.strikinglycdn.com/files/79caf357-6f10-45df-b8c0-b67f2faa4b1f/bash_script_comment.pdf
    • https://s3.amazonaws.com/wupuxus/72676628490.pdf
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_f4095363b6174634b368476a5ee61ebe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6236c0de-086d-4cde-b598-7b358f0ff2b3/basiromififag.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_off0000f194.bin
4416a819a8d95bf0276d11034cbabb4164315cfe0d8f211cdcb86d08c80cfbf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 5312 bytes
font_01_sfnt_off00010370.bin
6ca755daf53e878dc0467b031102eebd0c4f40a3758bf19e56cfde9d15ecbf31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 10264 bytes
font_02_sfnt_off000126a0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 4324 bytes

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