Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd02fc1b08ba95b6…

MALICIOUS

PDF

77.2 KB Created: 2021-04-03 12:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f81514b16376d7fd9781749b37ff8c6c SHA-1: a074cbb119447bbaed4daf7b97cd47679488e56c SHA-256: cd02fc1b08ba95b6e69790fad37e20cc2b2594bee687f39a612db8b675df978b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, but one prominent URL leads to a suspicious domain. This suggests a link farm or spam distribution tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://lozipotod.ru/aws?utm_term=conscious+discipline+in+the+preschool+classroom
    • https://defelewag.weebly.com/uploads/1/3/2/7/132741475/5786135.pdf
    • https://fasanisig.weebly.com/uploads/1/3/0/7/130739318/jorowavopodi_zuzokugel_vimam.pdf
    • https://funesovikigaje.weebly.com/uploads/1/3/0/7/130740183/faxatiwelebiwi-foweputaw-gidigivitopuxiz.pdf
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/tepikogekura.pdf
    • https://cdn.sqhk.co/dolitife/Qiehiib/xikonajifo.pdf
    • https://cdn.sqhk.co/motulobugaji/f3ibBmy/kindle_unlimited_romance_books_with_free_narration.pdf
    • https://cdn.sqhk.co/wogokodu/doGgfgg/joker_movie_hd_wallpapers_for_pc.pdf
    • https://rejejowurodesom.weebly.com/uploads/1/3/1/3/131398559/xesorozilix.pdf
    • https://nutuvujupakumap.weebly.com/uploads/1/3/2/7/132740288/wazoluju.pdf
    • https://nijuvijoz.weebly.com/uploads/1/3/1/4/131408832/3080851.pdf
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/fad6e27bb6f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_deb17e5a8f8c4196872db413f8d11bb6.pdf?index=true
    • https://s3.amazonaws.com/zaxawetawupo/92549317971.pdf
    • https://s3.amazonaws.com/kodipopujufipig/18171792868.pdf
    • https://s3.amazonaws.com/kalanejaxutilif/texerubilapiweno.pdf
    • https://s3.amazonaws.com/domegagowevag/how_to_day_trade_bitcoin_on_cash_app.pdf
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_0d56f1587d564eeb96774594d89eb0b1.pdf?index=true
    • https://s3.amazonaws.com/mejifavo/73059000659.pdf
    • http://kowotasube.epizy.com/supply_chain_management_system_project_report.pdf
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_e5deb935c8074c9f89ee267da86cf374.pdf?index=true
    • http://didaledagaxuz.rf.gd/buzolizulodafutolituf.pdf
    • http://ponadik.epizy.com/steering_committee_report_definition.pdf
    • http://vijijowop.epizy.com/free_google_chrome_cnet.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_off0000f03b.bin
8030a4fcad115240b8b22a01667786dea50792928b585b3e697818393eca6f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 5220 bytes
font_01_sfnt_off000101c6.bin
47100ffc1cf32586ed1917cefb3f43e2c2132321e3059c5c6052d1859370c8f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 11068 bytes

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