Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a01010ed79fa1f…

MALICIOUS

PDF

108.2 KB Created: 2021-03-26 07:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f8ae1c3f9c38dd355fd0fa15aa7bb92 SHA-1: 5143064a3a2bf4cfeccfd24b1d18c5e7a650bfe9 SHA-256: e7a01010ed79fa1f241a1cba0393d9660ea8d62bd99937b563d0be09ad48f709
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URIs points towards an attempt to redirect users to potentially malicious content.

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://pelibifir.ru/award?keyword=astm+a53+pipe+pdf
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/wironadexomowa_fesixugadi_wubofugef_sexaxotewa.pdf
    • http://kixurox.getenjoyment.net/96929279351.pdf
    • http://honey-love.ru/how_to_be_successful_as_a_civil_engineerc4fkd.pdf
    • https://perikoweb.weebly.com/uploads/1/3/5/2/135297066/5936705.pdf
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/08e5101da66d4e5.pdf
    • http://fb-ig-violation.com/st_astier_lime_paint_data_sheet4nokp.pdf
    • http://alsamcctv.com/annotation_symbols7523u.pdf
    • http://wersita.space/wonderful_christmas_time_pianovjmz8.pdf
    • http://kofodotig.sportsontheweb.net/alter_ego_2_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nejarisiwudu.atwebpages.com/do_your_best_try_your_best_friend.pdf
    • https://s3.amazonaws.com/lanorolowu/fusobuwirejiwu.pdf
    • https://s3.amazonaws.com/lerezazo/bogokezelefixiligidebafuz.pdf
    • https://s3.amazonaws.com/xenavuxa/obstructive_sleep_apnea_diagnosis_guidelines.pdf
    • https://s3.amazonaws.com/xufujofaleki/n-_butyl_acetate_safety_data_sheet.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
font_00_sfnt_off0000ef79.bin
30e7dd76745a451d97d7cd9a025357a144530dbd157c12bbdc71efb24c00ff39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 34788 bytes
font_01_sfnt_off000150cb.bin
1be3e95b8cb234bb5ee5df2033e521e58f4989e937286f3b638d09084ed04070		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150CB 5336 bytes
font_02_sfnt_off000162ea.bin
bfe00705fcdede0fd8fc1a560c8de9f4a687e7dc00fbc5b0a91b5a581a5cf835		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162EA 11824 bytes
font_03_sfnt_off00018b9e.bin
e3579828855871a07ecb3485e8a863529c431dc6bd287c4cad96ef3893bfc50c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B9E 16392 bytes

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