Malicious PDF — malware analysis report

Static analysis result for SHA-256 8346f8eb6baea4a5…

MALICIOUS

PDF

83.0 KB Created: 2021-04-09 03:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7498cc99e1063377fd0756d5bdc2c5b SHA-1: 2e6c2249d3021b4241b0859e2be6ebf12a15fcab SHA-256: 8346f8eb6baea4a5593277d9635fdaec4a7bb02d0486530ebd2812caa8eff573
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The embedded URL `https://jacksth.ru/strik?utm_term=microsoft+wireless+mouse+5000+manual` is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=microsoft+wireless+mouse+5000+manual
    • http://pasikufopubiwo.mypressonline.com/42615094791.pdf
    • http://dopogabijup.mywebcommunity.org/queen_another_one_bites_the_dust_piano_sheet_music.pdf
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/wotat.pdf
    • http://rolorutebu.sportsontheweb.net/vubupegitipigokeladid.pdf
    • https://saxepuxuk.weebly.com/uploads/1/3/4/4/134472003/nekifekamepi_valuzuladu_foxomevolugiw.pdf
    • http://nokojatagi.mywebcommunity.org/cement_concrete_pavement.pdf
    • https://muverope.weebly.com/uploads/1/3/0/7/130776407/8572453.pdf
    • https://jojonawizofobu.weebly.com/uploads/1/3/1/4/131438175/bakusoziwojose-xogati-manuxo.pdf
    • https://tesazovefikuk.weebly.com/uploads/1/3/1/4/131408970/tiporate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tiduro/53174732451.pdf
    • https://64db0a9d-d2b7-4705-beb9-75cca7f1d068.filesusr.com/ugd/4c6241_62b8bb181b834c949a703554f966e82e.pdf?index=true
    • https://s3.amazonaws.com/fowonaxul/52817280575.pdf
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_fd1638c1194a433f94498a7f47b0cfd5.pdf?index=true
    • https://80ce5912-1c67-4773-adf4-abf614566e91.filesusr.com/ugd/acb48a_26c56e3d25ed41e2b9fd0a864b36ca5d.pdf?index=true
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_0b0ebd2a3de04ffd81face45f2c91fc9.pdf?index=true
    • http://lewamomad.epizy.com/football_manager_2015_pc_requirements.pdf
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_f5cddedd1c55442cb91a3cde9f9097d1.pdf?index=true
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_e25f8c608eb84ba7996978f9532e3aef.pdf?index=true
    • https://s3.amazonaws.com/ruzaganog/alchemist_guide_bdo.pdf
    • https://fac7854b-22c3-40b9-bef9-ee94a55a010d.filesusr.com/ugd/fba82c_3576d97cf90741ef9d749a7ed1e9dcfd.pdf?index=true
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_49571aca41aa45eb8106601ee2d28eb8.pdf?index=true
    • http://fobegagefim.epizy.com/47796765420.pdf
    • http://nilavoforejexo.rf.gd/rukubelametaze.pdf
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_0ba017ab0d4047fd9d251fd5b91c8f15.pdf?index=true
    • http://fokawodi.rf.gd/displacement_reaction_worksheet.pdf
    • https://s3.amazonaws.com/xirixepo/massey_ferguson_tractor_135_price_in_pakistan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f980.bin
40ecc115a94adbfe10b028c755fd789e8ca3696ec0f7229f00069af9a2e711ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 5272 bytes
font_01_sfnt_off00010b67.bin
34e66ec515f97f8b9a13ca2b939f5bb214c71109cd478e7cb3943c7e3fec30fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 10740 bytes
font_02_sfnt_off00012ff4.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF4 4324 bytes