Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c164858d09bf51…

MALICIOUS

PDF

79.2 KB Created: 2021-03-18 04:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 953d7bf9f4826eacbac32d38cac541b7 SHA-1: 942bc81518eb4e93d21ab452025b618a2909ee17 SHA-256: 99c164858d09bf515aa2715aa5213910a4cf96b58dc6c62936d1d40c37a170c5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or content-scraping operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The embedded URLs point to potentially malicious or deceptive content, and the document body, though heavily obfuscated, contains metadata related to PDF generation and search keywords, reinforcing the lure.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=band+of+brothers+novel+pdf
    • https://cdn-cms.f-static.net/uploads/4375357/normal_6011b7827d63c.pdf
    • https://dabosimupit.weebly.com/uploads/1/3/5/3/135397997/firegowob.pdf
    • https://cdn-cms.f-static.net/uploads/4449411/normal_60152bda00eb6.pdf
    • https://tokajufifed.weebly.com/uploads/1/3/0/7/130775528/volod_pukaloxaj_taranadojusuro.pdf
    • http://form-lnstagramcopyrightservice.com/vevuwirofamusapiro2f6h4.pdf
    • https://cdn-cms.f-static.net/uploads/4491933/normal_6041107d09dc1.pdf
    • https://zitolibozix.weebly.com/uploads/1/3/4/0/134040523/80722.pdf
    • https://wikoxunorature.weebly.com/uploads/1/3/5/9/135968981/xadoxilujab.pdf
    • http://jushq.pro/what_to_eat_on_bright_line_eating9a41q.pdf
    • https://cdn-cms.f-static.net/uploads/4411932/normal_605010fd19ad8.pdf
    • https://cdn-cms.f-static.net/uploads/4408878/normal_6031bd644f20a.pdf
    • https://static.s123-cdn-static.com/uploads/4372399/normal_6002bc29d1af4.pdf
    • https://lufumapapolag.weebly.com/uploads/1/3/4/3/134353855/0a724b163ccc202.pdf
    • http://fb-ig-copyright.com/dodigetebemlrrvw.pdf
    • http://fiziwafofekaku.mygamesonline.org/91870891092.pdf
    • https://cdn-cms.f-static.net/uploads/4419235/normal_6012ca4df0600.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fisulefajow/64214414051.pdf
    • https://s3.amazonaws.com/sajatesawodiji/andi_mack_theme_song_sheet_music.pdf
    • http://jozobudesurarab.onlinewebshop.net/hopper_with_sling_not_starting_up.pdf
    • https://s3.amazonaws.com/kasuwevovog/full_form_of_rip_in_computer.pdf
    • http://vebusatoro.atwebpages.com/62707211737.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_off0000eb6f.bin
7aa0b73ec5275e54d05ab91dac33d8f294ca51286b15164a35778500318df3d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 5380 bytes
font_01_sfnt_off0000fdab.bin
5ae1d259d034084be61ec780dd0ff4f7394a348651cf58c8458f9478dd568280		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 1852 bytes
font_02_sfnt_off0001069b.bin
06999b9ada885ae0f95b4f7b07f08cfb55353efed0e751aa1075bace1cbac589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 11736 bytes

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