Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a589be45f458990…

MALICIOUS

PDF

78.2 KB Created: 2021-03-25 10:26:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c875940adf8afa7ba05668f6158a0fc0 SHA-1: a6c7a4cf7d34bfc03b12e29354f4226386143e48 SHA-256: 8a589be45f4589901fe77b3dd9ff9396c210ec7f447632355d91831f1038cb39
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identify it as malicious, likely a phishing or trojan delivery mechanism. The document body is heavily obfuscated and unreadable, suggesting it may contain exploit code or further obfuscated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=personal+development+plan+planning PDF link annotation
    • https://cdn.sqhk.co/mabisurud/d3jdiag/diverse_definition_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/mizopopowaze/ahfgfAY/biganulotitupedazejipuwa.pdfIn PDF document text
    • http://sandiego-podcasts.com/word_family_exercises70jda.pdfIn PDF document text
    • https://serijarivak.weebly.com/uploads/1/3/0/7/130776739/joxegof.pdfIn PDF document text
    • https://furimubabo.weebly.com/uploads/1/3/1/8/131856330/9c0a41e20cc.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikebepo/hgdgchc/nufapanuzivogo.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/DuiiicC/short_stories_life_lessons_from_grandpa.pdfIn PDF document text
    • http://trenketo.buzz/25547369753o8oxg.pdfIn PDF document text
    • http://strapslap.online/monitor_de_trafico_de_red_gratis4udxd.pdfIn PDF document text
    • http://remeik.ru/fortnite_season_10_prestige_challenges_guide27zli.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/a6gfVjj/duwelalabuvipapu.pdfIn PDF document text
    • http://mantenancie.com/shark_steam_mop_replacement_pads_canadian_tire2lb31.pdfIn PDF document text
    • http://gaydating.world/33487412584b6kad.pdfIn PDF document text
    • http://rivivivojizejit.22web.org/98784410502.pdfIn PDF document text
    • http://capridigi.com/pujivofolerulizovaravutz0aih.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/hdiih67/wooden_dice_tray_dnd.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/6Tqhcje/colornote_notepad_notes_to_do_for_iphone.pdfIn PDF document text
    • http://remont-kholodilnikov.website/bewars_movie_song_in_telugui1jsk.pdfIn PDF document text
    • http://xviiivbgz.com/add_a_font_to_wix1okhv.pdfIn PDF document text
    • https://vudeberas.weebly.com/uploads/1/3/3/9/133997553/ad96cc3adb22898.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vurasoda.rf.gd/74696439781.pdfIn PDF document text
    • http://puruguniteri.rf.gd/download_surah_yasin.pdfIn PDF document text
    • http://kiwimusef.epizy.com/23588704783.pdfIn PDF document text
    • http://dorowoz.rf.gd/aluminium_sheet_metal_wickes.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_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 5340 bytes
SHA-256: 740f55fa814189465681365e19647ed7ad9a80a4d10b6cbaac4774f1f62e3bc9
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 10532 bytes
SHA-256: 478bcd2dcace1a2db46e4f539464fe6285fc457aa4214743f92960fee2406d25

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