Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b48b9e2f124dff9…

MALICIOUS

PDF

108.2 KB Created: 2021-03-31 02:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1f6668f595cc1994a3c27bc04b182573 SHA-1: 2e84431b4d57c903e2607835a633a74e10ba84b1 SHA-256: 6b48b9e2f124dff9cf8d49350f10325f0b8235b1ead8dad8c93bbe7ff37b704b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the primary URL suggests a lure for 'act 64e practice test answers'. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://jumiwimov.ru/wix?keyword=act+64e+practice+test+answers PDF link annotation
    • http://sepibuzare.22web.org/vofatanadijinazanixir.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/25118335546.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/gfAuUjc/pamukoworuzivakisetiku.pdfIn PDF document text
    • http://motegolev.22web.org/bennie_and_the_jets_piano_sheet_music_free.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/adobe_after_effects_tutorials_files.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453336/normal_5ff1ee7dd2529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_604bc0f9138ba.pdfIn PDF document text
    • https://cdn.sqhk.co/zevijevam/T4WF2jj/lapiworebideg.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/jgB2Zjc/40491994967.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/mhdOPzb/grass_cutter_machine_price_in_kerala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_601b46a3a0da5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_602afcef43a8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421224/normal_5ffca53be8d2c.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/suleme.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/28247454569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_605c4d8073d01.pdfIn PDF document text
    • http://fidesuwuranotif.getenjoyment.net/bidod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_601e768234a9e.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/how_to_fix_a_dishwasher_not_draining.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/iSxQOLh/2134869177.pdfIn PDF document text
    • http://zumofujej.iblogger.org/fuwakomuk.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://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_a7e8cfd6992e420bbdd0bd1e53deebf6.pdf?index=trueIn PDF document text
    • http://meganisaniwo.rf.gd/45624006106.pdfIn PDF document text
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_fc3d12f2c08c44fe813b1dd5b8f95d2d.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_26f55a0a187640b59144ebd7be286806.pdf?index=trueIn PDF document text
    • https://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_69d170f7393a4c02b94e600dcf1c143c.pdf?index=trueIn PDF document text
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_a9b6c589b76b4217bf93b28ea6353291.pdf?index=trueIn 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_off00015ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CED 4896 bytes
SHA-256: 6e283adeb9eece9ec04a4f844985a1a9c7ce6a468f73e9160223f8bd9beed2cb
font_01_sfnt_off00016da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA1 10976 bytes
SHA-256: 6d4653ee7b9744ebabcef9eeca0298938da398cf21484e02663b7b44fe6e917d
font_02_sfnt_off0001930e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1930E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e