Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1dc5c12d53b432…

MALICIOUS

PDF

80.2 KB Created: 2021-02-10 05:32:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: af483b9a373b33ba2f4095f1a875a62f SHA-1: c5eea08cbfdc97ca71ce86da10bd455ba45afe2f SHA-256: 9b1dc5c12d53b432901a86d74d05339b36c6dfcd4c86b7106d9606fc32940cad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=tetris+battle+facebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366645/normal_601d3e6faf773.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/zonujofu.pdfIn PDF document text
    • http://motivawka.online/wujexavixerifebusenqkcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_601b47768e2c7.pdfIn PDF document text
    • http://arm-watch3.club/82973955093da59v.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/basebuvepifexalifanotudupsyoig.pdfIn PDF document text
    • http://vknart.xyz/google_play_store_dark_mode_apkx20vh.pdfIn PDF document text
    • https://kupifima.weebly.com/uploads/1/3/0/7/130775493/nuzuxezi_mopufuwajikuf_juxogal.pdfIn PDF document text
    • https://bazigumaxofiz.weebly.com/uploads/1/3/5/3/135383162/xivozixazutom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374840/normal_5ff96696e2f27.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/rowemilumu-witavumutale-remufa.pdfIn PDF document text
    • https://weromosamewose.weebly.com/uploads/1/3/4/2/134265498/sapajenudi-zepin-sujuxo-juvalotunowuso.pdfIn PDF document text
    • https://luxovifawus.weebly.com/uploads/1/3/4/3/134341193/tiwibatibapeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jigigapapidafe.epizy.com/53530177931.pdfIn PDF document text
    • http://jokokitot.rf.gd/aifa_ki_full_form.pdfIn PDF document text
    • http://diwovofuzeloxu.epizy.com/39324070011.pdfIn PDF document text
    • http://mamotupot.rf.gd/ardea_real_outcome_fund_performance.pdfIn PDF document text
    • http://mesobuze.epizy.com/acoustic_guitar_music_pack_1.pdfIn PDF document text
    • http://vonanovab.epizy.com/35890548701.pdfIn PDF document text
    • http://fipegaz.epizy.com/poragijekavox.pdfIn PDF document text
    • http://sevuvev.epizy.com/analytic_function_theory_hille.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_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 5028 bytes
SHA-256: aae06667ffb96b8388c9902056e98c077122ee53e0a1c35f2a78223b4dc17c43
font_01_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 10824 bytes
SHA-256: 7a60db0163f426e20936f23bc6c213fbbb30a0ddf5682c80ad5321b0ca577c94