Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8277d5c83b55b93…

MALICIOUS

PDF

80.4 KB Created: 2021-04-02 06:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 347db54a3cb67fb9ec30ff7c6fa687f7 SHA-1: e2a105cfffcfa94c57f7e1711e77c4b4a466fe0a SHA-256: b8277d5c83b55b93aa10b6e9da984a93a4974c0484f91849208404e6dd5e7a79
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 0.9991

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://kuzutuzo.ru/aws?utm_term=what+cord+do+i+need+to+update+my+garmin+gps PDF link annotation
    • http://bepelisufozasep.mywebcommunity.org/what_is_child_centred_approach_in_early_years_setting.pdfIn PDF document text
    • http://shmelev.pro/77796739054nr9ao.pdfIn PDF document text
    • http://wuzejava.22web.org/new_dmrc_metro_map.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401723/normal_5ff57096e2fc1.pdfIn PDF document text
    • http://electriccannoz.club/wegudovozijak9fo3.pdfIn PDF document text
    • http://jezonikiroka.mygamesonline.org/dididijepenaxusazibet.pdfIn PDF document text
    • http://helpforteam.com/what_i_know_for_surem0ces.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5ffc9be369410.pdfIn PDF document text
    • http://komarovskii.xyz/advance_directive_california_templatesqu8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_5fd112ad1fb6c.pdfIn PDF document text
    • http://pagudovor.iblogger.org/80421577074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492278/normal_5fe2bd33c8555.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dozanokipe.epizy.com/dsdt_patching_guide_rehabman.pdfIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_5f842f334e9a4a2cb2a8ddc70bf9129e.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_caedc68faebe4344a953b48dbfa4cbeb.pdf?index=trueIn PDF document text
    • http://megigezorozo.atwebpages.com/amendments_to_the_constitution_of_pakistan.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_9f0c00bab3824a25b7a2b2e599ebe736.pdf?index=trueIn PDF document text
    • http://fawexoja.rf.gd/56515681830.pdfIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_7347bfba2abb4bd392a72ea9ec77a5ef.pdf?index=trueIn PDF document text
    • http://junedujivoxoz.epizy.com/59787591589.pdfIn PDF document text
    • http://tujumuvozekusa.epizy.com/zezukogubavid.pdfIn PDF document text
    • http://rorokepu.atwebpages.com/joxinelunupimuvatidiveje.pdfIn PDF document text
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_514768d55117484882d14fab1981b270.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 5572 bytes
SHA-256: 9dac0f945123fc28f3f3c1ff6557e1cfd6d0f11144c8cb24926533f9ce16ec4e
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 10288 bytes
SHA-256: 02ecdf7e70ec8b22630c1f7df27e878d4224d4438e9331c3e1efac009a9a325f
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330