Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffe43fe83995a7f…

MALICIOUS

PDF

89.7 KB Created: 2021-05-13 00:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e4fd66bc5f42e9e051f900cbde0af708 SHA-1: ca23e564c0431f6eab8e68fab709c8e9549e438a SHA-256: 4ffe43fe83995a7ffaadefce1d709642e169dbcccf4a823637d6d74d333c96df
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'ponafet.ru', suggesting a phishing or malware distribution lure. The PDF structure and heuristic firings indicate it functions as a link farm, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=kill+a+watt+p3+schematic PDF link annotation
    • https://cdn.sqhk.co/baxoladipezu/jj8SijM/kuxasivevun.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/hc4hehh/real_car_racing_games_play_online.pdfIn PDF document text
    • https://cdn.sqhk.co/roduxokixuzi/5iEljbO/color_run_fundraiser_for_schools.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_5fdc1f9cdce7a.pdfIn PDF document text
    • http://vitrinachel.ru/96253189213bdhh3.pdfIn PDF document text
    • http://medicinfo.online/jasowuravugagadutoxulirodg6tgq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418178/normal_606742b61b44a.pdfIn PDF document text
    • http://umniashka.ru/11964405491n7fb9.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/jdjaji1/recontact_london_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/T4ghjhE/scanner_app_document_scan_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/Jjjggcl/9061587964.pdfIn PDF document text
    • http://biomaniix.website/51398758557kn0ox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365655/normal_5ff0db0d96473.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/3ggj5gi/memoji_apple_stickers_for_whatsapp_wastickerapps.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/et1VRdq/anyone_lyrics_john_wolf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dagasopones/vekivujasodowi.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/sijuvonusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cafd37a-130a-4d74-a1d0-11a60890e001/nasb_bible_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/travis_county_appraisal_district_protest_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/623d6688-7901-46ba-bfc4-b6175a46d041/golds_gym_trainer_720_treadmill_price.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_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 5300 bytes
SHA-256: 5dd7498a68130a492b09a211030869ed207d2998af6edfa8f73a5df0c9cf8989
font_01_sfnt_off00013160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13160 11928 bytes
SHA-256: 72aaac4c55ae6319b3a4b3cd8ca616597040a0c184321385d598c98cdd9e8870

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