Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b6ed7ade92d977…

MALICIOUS

PDF

85.7 KB Created: 2021-06-10 11:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 988bb51d3019a4e30fa135a50383bcee SHA-1: d37ef8c5c306124fb5a78c4f84d74ea5c22f6dda SHA-256: 08b6ed7ade92d977706b01d7c21844ca5c6ab39157925f612139353b08dacd97
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure for educational material downloads, which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://archism.ru/pbw?utm_term=class+8+english+grammar+book+pdf+download PDF link annotation
    • https://nakosedamewa.weebly.com/uploads/1/3/4/6/134612328/joloxadanujuj.pdfIn PDF document text
    • https://fofagova.weebly.com/uploads/1/3/4/3/134313529/gonutirav.pdfIn PDF document text
    • https://pifaxatopegamu.weebly.com/uploads/1/3/4/1/134108845/gunelalazev.pdfIn PDF document text
    • https://nolupomesu.weebly.com/uploads/1/3/7/5/137510536/0c390ca2603c.pdfIn PDF document text
    • https://pesilukijirizi.weebly.com/uploads/1/3/4/8/134864792/a67601.pdfIn PDF document text
    • https://kaxalosenawa.weebly.com/uploads/1/3/4/5/134576513/9950766.pdfIn PDF document text
    • https://setibadumizokeg.weebly.com/uploads/1/3/4/8/134880372/sodijilakoronuz_werukolisixaj_bumumuwono.pdfIn PDF document text
    • https://wovusowi.weebly.com/uploads/1/3/4/8/134886666/nuturiwovulere.pdfIn PDF document text
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/lojebopetaripilepev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cdb130c5-f554-4de7-b8f7-09e529b1051a/73763414130.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/huawei_p8_lite_2015_update_android_8.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/w/file/fetch/144448956/not_pass_probation_period.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a9af93-8041-440c-a6ad-dc74f8c09614/lunigapowexa.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144921471/jafotoruterapu.pdfIn PDF document text
    • http://rivikixizub.pbworks.com/f/todifuruzumokizosemojed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc6ae540-7674-4f46-95f3-f320a6b7ece5/la_la_land_-_epilogue_advanced_piano_cover_with_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6d4ddd-b91a-44d3-a932-67396d2b01ca/crystal_report_tutorial_in_asp.net_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/affa8f1b-f44a-41e5-aab7-d94e507b0d5c/what_are_the_symptoms_of_a_bad_egr_sensor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f095a4-bfe7-4501-858d-92fae68cd2bc/jukogozojuvojixajoxedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f9e077-1f7e-46c3-9f92-7565eee21582/32901264954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7c895d-1b32-4985-a155-23cdcef7d349/bhagavad_gita_chapter_15_lyrics_in_tamil.pdfIn PDF document text
    • http://zexowisam.pbworks.com/w/file/fetch/144756303/79434156795.pdfIn PDF document text
    • http://demopefo.pbworks.com/f/4753133.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/f/is_roblox_studio_compatible_with_chromebook.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/free_hwk_support_suite_2.11_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 5676 bytes
SHA-256: 13c8ad5de94005a1b42e2aadb5ca7bf0c68465d85f6fd8052215f1e692991cb3
font_01_sfnt_off00011547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11547 11048 bytes
SHA-256: f2acc5bc033923dcc3c65edaf542dca7d141d6bbd6f8ea4747cd0ef4e2434f18
font_02_sfnt_off00013aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378