Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5bdfa3e25fed5e…

MALICIOUS

PDF

100.6 KB Created: 2021-03-28 16:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d92da42c272f06c502747b953a0177e6 SHA-1: a9b464242b24a809f40efc0957b7492b1b03c839 SHA-256: 3e5bdfa3e25fed5eb4da029a2c59698924ec0048fff61dfd50df2016d46c6fbf
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=tamil+news+paper+pdf PDF link annotation
    • http://melivoxigozige.mypressonline.com/5891687848.pdfIn PDF document text
    • http://kazaxukiga.getenjoyment.net/75702281314.pdfIn PDF document text
    • http://netewe9.xyz/high_probability_trading_strategies9kco1.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/sennheiser_rs-175_wireless_headphones_and_receiver.pdfIn PDF document text
    • http://veronaital.space/azhage_azhage_album_song_mp4_starmusiqn1swg.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/the_process_of_rational_reasoning_from_general_to_particular_case_is_known_as.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/gdzwiaU/ripatet.pdfIn PDF document text
    • https://cdn.sqhk.co/kasunelebak/qrhi1ge/barber_shop_hair_salon_games.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokit/agbara_nla_movie.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_cc822754044845b5a265900111672856.pdf?index=trueIn PDF document text
    • https://e19809cf-df80-48c1-9975-8599b001ad7a.filesusr.com/ugd/062cdf_9c770b101faf4ec9972d32cf9b87513e.pdf?index=trueIn PDF document text
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_55c8daea667e497a8830a577a93f9180.pdf?index=trueIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_930463df84ff48158b6ae92e46ee6ffd.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_2de363ede278435285cc20f0c68a4473.pdf?index=trueIn PDF document text
    • http://xurosuforudev.atwebpages.com/algernon_blackwood_the_empty_house.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/zudolegawusevevagag.pdfIn PDF document text
    • https://8458b573-1d6d-478c-912c-b10a972f31df.filesusr.com/ugd/150112_40a474fbdbe94e5f972d03c8817d7ae6.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_d496cce498cb4f8896883f3b9455c4a0.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001285e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1285E 27888 bytes
SHA-256: f66fc7057d87a9a4b227c5e8f767846a3c65f567c8d41c5d056d6c04dfea4864
font_00_sfnt_off0001169f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 5228 bytes
SHA-256: 2497751e471dafd64c01ceed78f10db0a945f1bf62fd2ba24deef2c412fcabcf
font_02_sfnt_off00016086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16086 9780 bytes
SHA-256: cabee9e33fb9599d2d947f57ede02cb7d52f8d7f4adabd45c4f37ae789f2e06d