Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc3c67ac04a68f8…

MALICIOUS

PDF

71.8 KB Created: 2021-03-31 07:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cdabe1bde09f78d4bf51433fa3fbd367 SHA-1: e9d9e1c3b9c246c983ae579087f435005e02eb71 SHA-256: 5fc3c67ac04a68f89f456560c5a7425981c7a42fa3532ed3da25f87e7099e7d0
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many hosted on disposable domains, strongly suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, hinting at its generation method and potential use as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/wix?keyword=abnormal+psychology+susan+nolen+hoeksema+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418783/normal_6055a21996db4.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/what_was_the_number_1_song_in_2017qt2ew.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/doxorowenepuloko.pdfIn PDF document text
    • http://srakan.space/barnett_commando_crossbow_manualetxm5.pdfIn PDF document text
    • https://pesadoxemanuz.weebly.com/uploads/1/3/4/8/134852899/341089.pdfIn PDF document text
    • http://kitukotobov.medianewsonline.com/fajuzuzopajebupan.pdfIn PDF document text
    • http://tesar-krd.ru/fuzusotuvujizui2ocq.pdfIn PDF document text
    • http://zogometemo.sportsontheweb.net/catecismo_menor_de_la_familia.pdfIn PDF document text
    • http://1fps.ru/3_times_table_worksheet_printablenrt7b.pdfIn PDF document text
    • https://dexowexuwix.weebly.com/uploads/1/3/0/7/130739316/vomowabopovisi.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/how_to_rebuild_a_crown_pallet_jack_pump.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5ff6555858e9b.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/alphabet_in_arabic.pdfIn PDF document text
    • http://okstore.info/83700166062med80.pdfIn PDF document text
    • https://vevusivo.weebly.com/uploads/1/3/0/8/130874001/518160.pdfIn PDF document text
    • http://rudovatimokasum.medianewsonline.com/cakewalk_by_bandlab_tutorial.pdfIn PDF document text
    • https://buzezofolo.weebly.com/uploads/1/3/5/9/135964700/926f9.pdfIn PDF document text
    • http://ginupedarokuxu.getenjoyment.net/oracle_12c_end_of_life_extended_support.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_6026dc2267429.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijedan.atwebpages.com/best_commercial_grade_waffle_maker.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 5864 bytes
SHA-256: 8061dfe71fcf825aac30d2570f44dc89a20ee336ff135e875d1a030bb68efc98
font_01_sfnt_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 10756 bytes
SHA-256: 23d16969f596885a4272652dc3ed201344c7b92e99dc120526e421dd4df66201

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