Malicious PDF — malware analysis report

Static analysis result for SHA-256 620e2df38fdc9e89…

MALICIOUS

PDF

80.6 KB Created: 2021-04-05 07:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c073deb2b6f1783f19aedfec30c1bda4 SHA-1: f2a53310be00857fff7574a848281e43dbe30208 SHA-256: 620e2df38fdc9e896ead5578761fe7e787cb464dd94e3a8b8c4768d6990f15c5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable hosting, indicative of a link farm or SEO spam campaign. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious or unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/123?utm_term=400+tc+cotton+bed+sheet+set PDF link annotation
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/nivorodovavu_luziziwilova_balaxuliluw.pdfIn PDF document text
    • https://pozefixinez.weebly.com/uploads/1/3/1/4/131454190/beginu_sodobet_maduv.pdfIn PDF document text
    • http://arfesopt.com/how_to_fix_a_gamecube_disc_read_error_on_the_wiia79xd.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/Zhj6RQP/download_deserted_zombie_survival.pdfIn PDF document text
    • https://cdn.sqhk.co/zalivelo/g7lgfiD/is_frndly_tv_on_apple_tv.pdfIn PDF document text
    • https://buvonumonub.weebly.com/uploads/1/3/5/3/135304713/1827226.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/8e51b918c0bd8bd.pdfIn PDF document text
    • http://snail-case.store/crown_xti_4002_for_salexu537.pdfIn PDF document text
    • http://atomyimperial.ru/panamojaxisawodimus8we.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/ha9ifgi/animal_sounds_for_toddlers_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_600b68971ce69.pdfIn PDF document text
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/13f9e8f3.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/jaBiegg/25961567744.pdfIn PDF document text
    • https://lufotoloxa.weebly.com/uploads/1/3/4/3/134318907/7064555.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/nopadewaf.pdfIn PDF document text
    • http://leyloften.online/servpro_reviews_bbbw6ki2.pdfIn PDF document text
    • https://nifiguxo.weebly.com/uploads/1/3/1/3/131398563/xapaxa-famufen.pdfIn PDF document text
    • https://kimilofu.weebly.com/uploads/1/3/0/8/130873947/konokub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467936/normal_602e61b205fa0.pdfIn PDF document text
    • https://cdn.sqhk.co/bopesajan/dqxifDQ/34765483770.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c7197b-e8d0-4200-8ee8-d3acdd66507b/57795358283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24de0751-7bf5-4e44-9819-14d0abfd7ba4/tales_of_demons_and_gods_light_novel_chapter_275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb3da60-8630-4035-a21c-88626fb1b774/how_do_you_reset_a_kenmore_stove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47def778-ffad-471a-b71d-117351b96df0/95037203297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2606b615-6bc8-4ea0-910f-38ccdc4d4b72/29842294666.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_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 4964 bytes
SHA-256: f1be85ca11576c66aef555c16e5352c286c898717a39ac1849246bdaa904c6ce
font_01_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 11424 bytes
SHA-256: 2032569f7ed246aac0601bcdf501f658d8381c3b827ddeee6c04ff18c11fb6be