Malicious PDF — malware analysis report

Static analysis result for SHA-256 82426c255e15ad81…

MALICIOUS

PDF

75.4 KB Created: 2021-04-01 16:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cc372ce48ffef245782fe7facf20a1f SHA-1: 9e5b85e89c3445c4324c21b7a96448a571392e64 SHA-256: 82426c255e15ad81d0db1f93e2fc74f774cb8c28b1a33519a26ec64055b4401e
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-optimized and point to other PDF files, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document, likely delivered via spearphishing.

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://botokaw.ru/123?utm_term=and+1+street+basketball+apk
    • http://help-verifiedbadgecenter.com/winchester_model_94_deluxe_short_rifle_for_salegpz9q.pdf
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/98f1da579bf7fe.pdf
    • http://nowukusox.mypressonline.com/87188873914.pdf
    • http://dasezin.getenjoyment.net/33774755916.pdf
    • http://kemytbok.xyz/how_to_clean_burn_stovesydwny.pdf
    • https://cdn-cms.f-static.net/uploads/4366647/normal_6052d7abc8ff4.pdf
    • https://cdn-cms.f-static.net/uploads/4501975/normal_60356ca9c210a.pdf
    • http://raicen.com/75478677375jo9we.pdf
    • http://jelojutu.sportsontheweb.net/history_of_agriculture_in_africa.pdf
    • http://riwozizedilar.mygamesonline.org/duzer.pdf
    • http://lapivakop.getenjoyment.net/syllabus_of_airforce_x_group_2020_download.pdf
    • http://life50it.pro/aniversario_de_la_constitucin_mexicana_inglsjh9bj.pdf
    • http://fojefojegut.medianewsonline.com/english_grammar_tense_tutorial_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fd27faa604a5.pdf
    • https://cdn-cms.f-static.net/uploads/4418175/normal_6016739a498d9.pdf
    • https://cdn-cms.f-static.net/uploads/4380883/normal_5fd79d59da0ca.pdf
    • http://igbusinessabouthelp.com/what_are_the_5_theme_parks_at_disney_world11yza.pdf
    • https://pekixozere.weebly.com/uploads/1/3/5/3/135397988/7217343.pdf
    • https://cdn-cms.f-static.net/uploads/4417220/normal_601b9bfbe2a9d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zedowep.atwebpages.com/44543976619.pdf
    • http://pabewuvuxaf.onlinewebshop.net/bayesian_reinforcement_learning.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_off0000dc9d.bin
9a596d03d53e2711d97a0ede16b2aef7261e60098f92273ea56dc7c15e00b6d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 4828 bytes
font_01_sfnt_off0000ed01.bin
b0fd82586a120a163f4642cc99ebb88c488b8d3ff48b09c1940ad2857983e51d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 11040 bytes
font_02_sfnt_off00011226.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 4324 bytes

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