Malicious PDF — malware analysis report

Static analysis result for SHA-256 656fbe5ef24c8010…

MALICIOUS

PDF

78.8 KB Created: 2021-04-10 11:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d8f9851d4d489690b6e14f6c13b570de SHA-1: efc04481ee3c5614ab495420a9f5ec23393071f8 SHA-256: 656fbe5ef24c80101dff9703485645075630bb13dabaa9e4d780e06eb7825fa4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, appears to reference a 'Singer heavy duty model 4423 manual', likely a lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://leonvi.ru/strik?utm_term=singer+heavy+duty+model+4423+manual PDF link annotation
    • https://puziwurawube.weebly.com/uploads/1/3/1/8/131871408/2518594.pdfIn PDF document text
    • https://mudufisapegew.weebly.com/uploads/1/3/6/0/136097401/2705397.pdfIn PDF document text
    • https://nudimulax.weebly.com/uploads/1/3/6/0/136010194/5480830.pdfIn PDF document text
    • https://rufekelikofevav.weebly.com/uploads/1/3/1/0/131070689/jurusufinudisuxuli.pdfIn PDF document text
    • http://bodipok.getenjoyment.net/buxoxetekusupeter.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/65516249922.pdfIn PDF document text
    • https://dijodiruji.weebly.com/uploads/1/3/4/0/134097483/81b74f0415ae791.pdfIn PDF document text
    • http://vuletotam.scienceontheweb.net/zifiwesewu.pdfIn PDF document text
    • https://lamegebepezaris.weebly.com/uploads/1/3/1/4/131438642/2546878.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/bisivaretiwigaxelapa.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/cementation_process.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/3559795.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://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_15417ad053444e17abd62d9403ce8ff6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/91458784796.pdfIn PDF document text
    • https://1b6a1bbc-c127-422b-858f-c975555fd18f.filesusr.com/ugd/31f47c_1e609346baed4ea5a62984548e08ef53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/quotes_thomas_merton_thoughts_in_solitude.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/42219519973.pdfIn PDF document text
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_7f2fd4ac40f64af48d764d9051c96754.pdf?index=trueIn PDF document text
    • http://kivazitegolaluz.rf.gd/71379703310.pdfIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_58428c6864754758b4c93d4540e99f46.pdf?index=trueIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_293b5ad6523c40328787391a9c8e95af.pdf?index=trueIn PDF document text
    • http://tavokitewigi.rf.gd/mpls_vpn_interview_questions_and_answers.pdfIn PDF document text
    • http://nibewisule.epizy.com/digital_marketing_interview_questions_for_freshers.pdfIn PDF document text
    • http://kunivoji.epizy.com/can_i_run_android_app_on_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/avatar_telugu_full_movie_movierulz.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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 5592 bytes
SHA-256: 92b3d62279fb851ae5e67c895a246c9104d54bfedd2e2dd8eb8e1fc6c0a9827d
font_01_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 10708 bytes
SHA-256: 256a6861122e87b642d80b13a2f98012a42f9f0feea16bfb14cad47d4211dd25
font_02_sfnt_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

Open this report in the interactive analyzer, or submit your own file for analysis.