Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad535c28348406a…

MALICIOUS

PDF

116.1 KB Created: 2021-03-28 08:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0730a9b0f837c028551a927806bad18a SHA-1: 551a1ed2479489e01f36edab484ceee936193eeb SHA-256: 0ad535c28348406a5a6caa20136d3106eecb8879f30e57ac7c7f476fc91f69bd
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to a suspicious domain, 'midufew.ru', which is likely part of a malicious campaign. The ClamAV detection and ML classifier further support the malicious nature of this PDF, suggesting it's a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://midufefew.ru/wix?keyword=more+mindless+violence+2
    • http://reduslim-ufficiale.website/58588706470fv52u.pdf
    • https://cdn-cms.f-static.net/uploads/4465685/normal_5fe64ff957ab3.pdf
    • https://zugogulubituwo.weebly.com/uploads/1/3/4/2/134266111/2166102.pdf
    • http://xixubitawub.iblogger.org/best_biodata_format_for_job.pdf
    • https://dujefeva.weebly.com/uploads/1/3/4/5/134589135/julopimodomodaxobi.pdf
    • http://slampochka.ru/kopalio0apm.pdf
    • https://lulapusorifat.weebly.com/uploads/1/3/1/4/131436971/9207089.pdf
    • https://cdn-cms.f-static.net/uploads/4446016/normal_6048c02668982.pdf
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/8998e00ba73.pdf
    • https://static.s123-cdn-static.com/uploads/4410201/normal_5fcf0c09ec190.pdf
    • http://cleaner-inn.club/glacier_bay_kitchen_faucet_installation_videotsrha.pdf
    • http://hookup154.fun/devujosesaso2wt2e.pdf
    • https://rumidevuj.weebly.com/uploads/1/3/4/3/134310249/xasezudedabiwir-tipavutunelig-ziloxisu-mezegiladixu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gopogawamo.rf.gd/7258812409.pdf
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_ced74792c22e4253810d196a2eadd67e.pdf?index=true
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_df0ee7e8d81e466fa25d2e69fc98f2c6.pdf?index=true
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_248590de9f634f01a241dbc86226ac64.pdf?index=true
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_0c77516f64894e6cba03ddfd9e3b9556.pdf?index=true
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_a6f9205cfe0e426689fd1785125f01ae.pdf?index=true
    • http://wagadepepixapu.epizy.com/13103026585.pdf
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_0254313e657747e6a1c2ee1ca04f47ad.pdf?index=true
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_795b751f45054176a3a0f9926c238abc.pdf?index=true
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_3421adaeae094a02b99f3ac20fb49da7.pdf?index=true
    • http://gedanenek.epizy.com/13803730130.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000dc03.bin
536a1cbeb2d2c9e6b0746142d85072b0ef9c53684d1611fac4d0f66d799f63f9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDC03 51412 bytes
font_01_sfnt_off000177d4.bin
7cf3a642ef7a80083b891b44737b002e1df1fce7573d8686e6d20b9a32a024d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177D4 5072 bytes
font_02_sfnt_off00018917.bin
57f8e23aa8abd3294ca98644fa240e0d750e6ce5999928b7a8c496be2de4c1cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18917 10576 bytes
font_03_sfnt_off0001acd6.bin
207faf14306426b668b87aba0c9d447b8ba40b67f0f7b18660ffa0d3c8132265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACD6 16224 bytes

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