Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be1b4c2e5a93e3c…

MALICIOUS

PDF

84.0 KB Created: 2021-03-12 14:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 331898d01c8d65e3ef3ed454f1e47853 SHA-1: e32ee49a05cadb492df2588e73428b300b0fd0be SHA-256: 9be1b4c2e5a93e3c1221afc2c756d2307d79725920475e9a923d6df155da34be
164 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a suspicious domain 'resalured.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of numerous external links suggests a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://resalured.ru/strik?utm_term=how+do+you+write+a+date+range+in+ap+style
    • https://cdn-cms.f-static.net/uploads/4387704/normal_601a59c62283a.pdf
    • http://ruvikuvi.mywebcommunity.org/assumptions_of_logistic_regression.pdf
    • http://pewekelexu.mygamesonline.org/13583320640.pdf
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/mimiwajiweporo-gewonudep-saxivixuz-robusisir.pdf
    • http://tefitagesev.mypressonline.com/86669396543.pdf
    • https://fuzizozole.weebly.com/uploads/1/3/4/6/134630054/dezidurut.pdf
    • https://cdn-cms.f-static.net/uploads/4367301/normal_6038c5f3b75f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_8a5e46d59d1d48a5993b9f35ea2589c4.pdf?index=true
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_73f73c324034463ea8cb2bc37685140f.pdf?index=true
    • https://s3.amazonaws.com/gewisetug/85282008964.pdf
    • https://s3.amazonaws.com/fizup/67993640981.pdf
    • https://s3.amazonaws.com/tutasujal/mubukigigeduko.pdf
    • https://s3.amazonaws.com/sifawekujiki/can_print_from_quickbooks_online_have_multiple_companies.pdf
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_92952cddb6834900bc089c5854f06997.pdf?index=true
    • https://s3.amazonaws.com/rumezo/what_size_are_clipper_guards.pdf
    • https://s3.amazonaws.com/lakujusitejojet/knight_rider_piano_sheet_music.pdf
    • https://s3.amazonaws.com/patilawasu/creepy_crawly_pool_cleaner_not_moving.pdf
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_2e8ca60b849e4f018055a0d7343ecd3b.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c4.bin
02632a6e05e36d1571f3cf3d73c059818f81ee8212059d70f57b907e7cc1727f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 5280 bytes
font_01_sfnt_off000105de.bin
abf54ea73ad0976a14641a8806af0f4a487d96af49f8aebf92658c525bae97c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 11224 bytes
font_02_sfnt_off00012c15.bin
d4aae156ec6e8489d33afb6fad4be8c1315b5c882b5fb5fb5cd0fca9d06f1bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C15 16084 bytes

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