Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec34aa3c904232e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-15 01:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55b0f3eb052093572cde3229433146db SHA-1: 562cf31dc4b955eefd646d77500b7b62ead85d5a SHA-256: 8ec34aa3c904232edb1504d7dc2ccbc28d9a5ce3d23f4280f31fd1860550bfef
196 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a large number of external links, with one pointing to a suspicious URL (jumiwimov.ru) and another to a potential payload (s3.amazonaws.com/xumakomowi/golotewigutibe.pdf). The SE_PASSWORD_ARCHIVE_LURE heuristic suggests the document may be part of a multi-stage attack involving password-protected archives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/123?utm_term=globo+reporter+sobre+fernanda+montenegro
    • https://cdn-cms.f-static.net/uploads/4367903/normal_60473cfee4659.pdf
    • https://static.s123-cdn-static.com/uploads/4426062/normal_5ffe809ee4d3e.pdf
    • https://cdn.sqhk.co/bitomasijelo/j95ohc7/hungry_shark_walkthrough_and_guides.pdf
    • https://cdn.sqhk.co/metusoteliza/FoIjage/93578021373.pdf
    • https://static.s123-cdn-static.com/uploads/4421767/normal_5fc67e9360a10.pdf
    • https://cdn.sqhk.co/gegatuzikat/aiaIheD/34839055839.pdf
    • https://static.s123-cdn-static.com/uploads/4486215/normal_60089da2e1870.pdf
    • https://static.s123-cdn-static.com/uploads/4443815/normal_6004cc6c58a1b.pdf
    • https://cdn.sqhk.co/josipinu/sgjjahb/malvern_hills_battle_application_fees.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xumakomowi/golotewigutibe.pdf
    • https://s3.amazonaws.com/tonisefoteka/vuetify_v-_data-_table_template.pdf
    • https://s3.amazonaws.com/rujabepifar/33932244226.pdf
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_a64ced2e1a9b4594b9e2964dae8789ce.pdf?index=true
    • https://s3.amazonaws.com/xufujofaleki/madaxu.pdf
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_73f9f05b40d14b399bb19d3d56d0b5a4.pdf?index=true
    • https://s3.amazonaws.com/webipejonavuv/gukarajarotubutu.pdf
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_58f769c88ce540d190e4429014713bcf.pdf?index=true
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_6484ae9674fb4123a77da10db72fbc2e.pdf?index=true
    • https://s3.amazonaws.com/xipavir/vilazelo.pdf
    • https://s3.amazonaws.com/rupatojuko/is_twilight_midnight_sun_on_netflix.pdf
    • https://s3.amazonaws.com/kufazete/fifomevakujubiwu.pdf
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_a117c1aa3e034ac081173841061ea8fc.pdf?index=true
    • https://s3.amazonaws.com/xewamejixolefaj/free_powerpoint_presentation_templates_for_tourism.pdf
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_5fcdab9e663d449796be98f29e020f9d.pdf?index=true
    • https://s3.amazonaws.com/fobupojowojon/event_planning_proposal_template_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea5.bin
fad6cae7c26b1dd89c860a1b74009dc634eb075e7db5f07f3031202fb6634e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 5532 bytes
font_01_sfnt_off0001015d.bin
5c577a63254dc23316e671389b912b44374e74876c2f2ced17c08dc9271c1d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 13208 bytes

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