Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf43ff6d2b54f6c…

MALICIOUS

PDF

85.4 KB Created: 2021-05-13 22:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c52d32aeba78ee91b0050d048c73cc3 SHA-1: 464b2668207297c209b3b198d4194e95d3e1d5a7 SHA-256: 2bf43ff6d2b54f6c3f7fd5e20f89cb095652819c972e7c695e4a9303ad3fc1f7
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 point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing or trojan PDF. The document body, though heavily obfuscated, appears to be a lure related to product usage, directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/strik?utm_term=how+to+use+rowenta+x-cel+steamer
    • https://cdn.sqhk.co/ritapabinap/FQijYwe/nigaxiravobubupazi.pdf
    • https://cdn.sqhk.co/nuvexajamu/ikGiZha/guidebook_definition_and_examples_of_hyperbole.pdf
    • http://hangzhoumetal.ru/how_to_measure_depth_in_perspective_drawingbzeqw.pdf
    • https://guwiretaxuzaji.weebly.com/uploads/1/3/4/6/134687660/siminukisade.pdf
    • https://jonimewogil.weebly.com/uploads/1/3/1/8/131860125/5723967.pdf
    • http://kleomaften.online/xeputafesaxitexokosaf6mc9.pdf
    • http://globalsafegroup.com/62257607412bgd0l.pdf
    • https://cdn.sqhk.co/bureruverog/gheaZ3H/11379723721.pdf
    • https://rowimunikak.weebly.com/uploads/1/3/5/3/135346477/zewafe_tosir.pdf
    • http://runuxop.iblogger.org/acknowledgement_template.pdf
    • https://cdn.sqhk.co/lafuwexale/hiahcbh/xepinabafod.pdf
    • http://xupoluwifokolo.22web.org/27390021513.pdf
    • https://pavovebowejimop.weebly.com/uploads/1/3/1/6/131607108/kifol.pdf
    • https://cdn.sqhk.co/sekijebasazi/ia2gciw/brevida_mask_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/guvovigo/denon_avr-_x1500h.pdf
    • https://s3.amazonaws.com/sorogamat/vubiwo.pdf
    • https://s3.amazonaws.com/tiduro/carson_dellosa_math_grade_3.pdf
    • http://tonugakor.epizy.com/catalogo_hinode_ciclo_2_2020_baixar.pdf
    • https://s3.amazonaws.com/lorifawuvawot/dabopiwitovotonuwap.pdf
    • https://s3.amazonaws.com/xifabilejilab/breaking_bad_english_subtitles_for_spanish_parts.pdf
    • https://s3.amazonaws.com/wopari/alcatel_go_flip_manual_bell.pdf
    • http://lafeseg.rf.gd/accenture_plc_annual_report_2015.pdf
    • https://s3.amazonaws.com/fazujo/13782997481.pdf
    • http://tenasupufowok.epizy.com/cherubic_hymn_sheet_music.pdf
    • https://s3.amazonaws.com/forupokisip/nijakufoxufetefek.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_off0001019d.bin
5e8289a148d1f4e259992c97ebfb45ef6a7331cb551ee4201c8e944c4f6d9c1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 4932 bytes
font_01_sfnt_off00011262.bin
2c866a919de4e88e73c9764a2ce79aba461b0854f04a93dec852dcbad94d6250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 11084 bytes
font_02_sfnt_off00013841.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13841 4324 bytes

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