Malicious PDF — malware analysis report

Static analysis result for SHA-256 2035f517a4ddf189…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 15:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a567b450e0f27cdd4bae487cbfc34897 SHA-1: bbf94a96821a89b1065bb4185e690b3be55dee21 SHA-256: 2035f517a4ddf189765e83d4c48f23f9541b5b02772cf0bd6717431d8977d76f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than a legitimate document, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/strik?utm_term=cards+against+humanity+online+bad+apples
    • https://cdn-cms.f-static.net/uploads/4384296/normal_6041a97940223.pdf
    • http://narovomesizi.medianewsonline.com/25115211533.pdf
    • http://smotrikino.fun/what_does_an_evaporation_line_look_like_on_a_blue_dye_testao3pc.pdf
    • http://dejamorije.scienceontheweb.net/carnivalesque_bakhtin.pdf
    • http://gnfcns.info/zexafofup301ph.pdf
    • https://cdn-cms.f-static.net/uploads/4472213/normal_604a7960ebfc8.pdf
    • http://milesnires.xyz/newborn_apgar_score_sheetpoitc.pdf
    • https://cdn-cms.f-static.net/uploads/4467915/normal_6023b939962c3.pdf
    • http://bimonetejatoleb.mygamesonline.org/80978659305.pdf
    • http://jekeluxuto.mywebcommunity.org/webiwaseg.pdf
    • http://pubgmobiie.com/can_a_thermometer_give_a_false_high_reading9miu2.pdf
    • http://kimujedat.mygamesonline.org/8221929925.pdf
    • http://prizinsta365.online/71243280804d2dcz.pdf
    • http://mazafaka69pussy.online/moto_traffic_race_2_multiplayer_mod_apk_downloadh1ran.pdf
    • http://dusanaputojinon.mygamesonline.org/faxasugokevesi.pdf
    • http://bewewafip.scienceontheweb.net/89674724068.pdf
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fcedcb52f894.pdf
    • http://xorimomupajo.scienceontheweb.net/javascript_blob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://giworutiw.myartsonline.com/32844912715.pdf
    • http://pilejifizodan.onlinewebshop.net/29565562398.pdf
    • http://dezobod.onlinewebshop.net/destination_b1_answer_key_download.pdf
    • http://nufiwimuzobo.onlinewebshop.net/vemenaxizewazalidenapi.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_off0000eb69.bin
cb455af8ef3617bbc6778bd73db14ab76f05964cbadb7ce2caf19a8f32bf7c15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 3800 bytes
font_01_sfnt_off0000f8f1.bin
7800e6d334766fa9feb7b1a68a0e3c1471d32388e86be01119c1739bc39863b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 5520 bytes
font_02_sfnt_off00010b8b.bin
fc19d4caaaef9e836b0a900075a49f1fa35b4547a18c05f3c662c3460cbe905c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8B 10468 bytes

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