Malicious PDF — malware analysis report

Static analysis result for SHA-256 192d781170def937…

MALICIOUS

PDF

66.2 KB Created: 2021-04-03 21:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e90de77636b317f48bb86e1631c99a11 SHA-1: 73d50fb41900ac1a03a210bae75dd29d123276bc SHA-256: 192d781170def9374426dac77d70ba89bfd96803408a2c5304d413c267a23203
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm designed to direct users to malicious websites. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of numerous unknown reputation URLs further supports the malicious intent.

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-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=pot+belly+stove+army
    • http://lelekelosutov.getenjoyment.net/jumping_the_broom_2.pdf
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/migive.pdf
    • https://rikekipodoze.weebly.com/uploads/1/3/0/7/130776447/tibosonupebubebigu.pdf
    • http://gowanenutik.mypressonline.com/xasexuxi.pdf
    • http://frontglass.xyz/kegawuzonafefatet4cdgw.pdf
    • http://allerlo.xyz/75051620203r20nx.pdf
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/c8f059e.pdf
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/4199050.pdf
    • http://roskycnmx.com/vasijufixodobopokajj3zjh.pdf
    • http://beviluxenumiliv.mywebcommunity.org/33819866617.pdf
    • https://favigogijow.weebly.com/uploads/1/3/4/6/134643924/4714865.pdf
    • http://palitra-cveta.ru/bye_bye_blackbird_ukulele_tabjur1m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_15e83d07d12c4a0ba819cd4eaf2dea5c.pdf?index=true
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_71440a129b1e49f997c87ba2fc1c885f.pdf?index=true
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_5b25315c96ce4cbfb656678e10991eb8.pdf?index=true
    • https://s3.amazonaws.com/rojalexipokadaz/83745961233.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_b3bc1eba304a45078b748bf03bd238bb.pdf?index=true
    • https://s3.amazonaws.com/varoximu/history_of_thanksgiving_cryptogram_answers.pdf
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_c5a4eab2278d4189a6bb7178250b139d.pdf?index=true
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_cb1ed115e25449c38dd787c1d501a1b0.pdf?index=true
    • https://9cc03a5b-da86-4a44-8f3d-15f7580f9586.filesusr.com/ugd/cac91c_c2be6e9d12654a10bda20869d77c9b80.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_off0000c6b8.bin
d6f8c090127e4d0b663d30b0b198542060769048a8d3833ea0a9b09097e2f0b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B8 5136 bytes
font_01_sfnt_off0000d822.bin
7c4e0a11bca5bbd52403846f7fc8da537a43b9d13c4df73c0a94e60f572ee7a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 10432 bytes

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