Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f85bea835adb03…

MALICIOUS

PDF

79.9 KB Created: 2021-03-31 05:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba7b930e9b66577d057bb85be84d4385 SHA-1: 52310781a917d07473dbde55d688bb2421cabadf SHA-256: c6f85bea835adb03b25ee39d0cfbf70922a0ce3621f8ed3524b5feea5542c4e5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document employs social engineering tactics, specifically a 'Browser extension / update installation lure' and a 'Visual download / call-to-action button lure', to trick users into performing an action. It contains numerous external links, suggesting it may be part of a link farm or phishing campaign. The primary URL identified is https://lozipotod.ru/wix?keyword=facebook+profile+view+notification+chrome+store, which likely serves as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/wix?keyword=facebook+profile+view+notification+chrome+store
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5fc93686600c7.pdf
    • http://venira.su/343175148003rkq1.pdf
    • https://vasoderavir.weebly.com/uploads/1/3/4/7/134728489/lezawodipekarakolel.pdf
    • https://fifesijewawo.weebly.com/uploads/1/3/1/4/131412558/3993511.pdf
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/talejuza.pdf
    • http://picsonair.com/96263971433q2g6c.pdf
    • https://wokumedepawal.weebly.com/uploads/1/3/4/6/134607606/suzaxifarig_memaxitifoxuki_nakerisenegav.pdf
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/kutejoxubi_musidavo_kezibazuj_terowizuzorizu.pdf
    • https://dunexekexafu.weebly.com/uploads/1/3/4/6/134622254/7903720.pdf
    • https://pejudipevunasu.weebly.com/uploads/1/3/5/3/135351173/refodepoganijap.pdf
    • http://zolewuren.22web.org/8004561284.pdf
    • https://static.s123-cdn-static.com/uploads/4372377/normal_5fe49a3bc0181.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zejagal.rf.gd/60761501075.pdf
    • http://difiwawi.epizy.com/32066733564.pdf
    • http://vekowaxijoperun.rf.gd/candidiasis_genital_hombre_tratamiento.pdf
    • http://sikejilewiz.epizy.com/nilitodorolapozefapu.pdf
    • http://kofufinaniba.rf.gd/lovilujajomelalebidor.pdf
    • http://toxuvuzi.epizy.com/63507307937.pdf
    • http://mesibes.rf.gd/potegipetiwulo.pdf
    • http://nidaxapo.epizy.com/beri_beri_disease.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_off0000f67a.bin
805edbc903ba82a090d17a494140891ff8c07cb2a2285ae64da3be7105179a01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 5564 bytes
font_01_sfnt_off0001094f.bin
20fc7c49e36774d6c605187df73c1c95d2ba4b8be98a06aa3fad9a26b43e0dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 11572 bytes

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