Malicious PDF — malware analysis report

Static analysis result for SHA-256 88920a9b79fc432c…

MALICIOUS

PDF

78.4 KB Created: 2021-03-21 09:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9a23d20446b6d4b5dfb81eda677608f2 SHA-1: ceecbf209dc20a4d9d410667fc8fecfd2a2ee519 SHA-256: 88920a9b79fc432c5b92b535920034edf765a570304b709808ba2da3c4706a53
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('botokaw.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=acf+vtam+programming+manual PDF link annotation
    • https://venozosuvizulul.weebly.com/uploads/1/3/0/8/130814909/tagojisewim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5ffb7e9eae242.pdfIn PDF document text
    • https://minileponefij.weebly.com/uploads/1/3/1/0/131070526/5262794.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/8jghfx6/bisurenozudeba.pdfIn PDF document text
    • https://ronumotesagazuw.weebly.com/uploads/1/3/4/3/134373959/mejosez_tilisane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380382/normal_5fffb2e56b289.pdfIn PDF document text
    • https://cdn.sqhk.co/felebamifuk/dHN8Djj/word_peak_word_search_game_world.pdfIn PDF document text
    • https://cdn.sqhk.co/jomawutid/YkijI87/minecraft_island_village_seed_xbox_one.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447278/normal_601e8f0ebb0db.pdfIn PDF document text
    • https://zowamuzifam.weebly.com/uploads/1/3/1/1/131163536/jurag_xoxamagoba_sufefidetubifij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485711/normal_605263868621f.pdfIn PDF document text
    • https://vabinori.weebly.com/uploads/1/3/4/3/134348027/womemegur.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/cMihjdV/68409091163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_6010f57af3d70.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/0bd3b295-ab5f-4dd2-8236-4cffca9e9e00/32755057732.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/socialismo_cientifico.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/zugov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c08a083-91db-42b2-8721-a57388f7a730/how_much_do_it_cost_to_spay_a_rabbit.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/pic_assembly_language_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1310c78-28a8-46ad-adfe-d029eab86127/is_twilight_a_good_book_for_12_year_olds.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/damemil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78257fd4-3a6f-4f73-982f-a12713a59ac0/wilatadaxu.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_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 5204 bytes
SHA-256: fed09cb47e4bb3f67b49a7a137b5e2deb906f6ad63d9d48df11132bb0d6b6979
font_01_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 10144 bytes
SHA-256: 5b7bca1196c94bac132d5ef3a4c6d78586852ab5583a06557762e16b9f6382ee