Malicious PDF — malware analysis report

Static analysis result for SHA-256 af496146b9b1c1d9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 10:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3ea19615a66cf97ed60b01a7b495208 SHA-1: 415d0cf1d08397894bd2bb4ac968dae9192598f8 SHA-256: af496146b9b1c1d973af86ee471bcfef1f04576d611b8635e706636dded43f89
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. Heuristics for a download button lure and password-protected archive handoff suggest a phishing or social engineering attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=cheat+codes+for+god+of+war+chains+of+olympus+ppsspp PDF link annotation
    • http://mundori.com/js/ckfinder/userfiles/files/zukukopubofikozulodafan.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210905170301.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tesuzewurupagasatas.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/65263509064.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/kodorapikox.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109102328333539.pdfIn PDF document text
    • http://afslab.asia/upload/files/delam.pdfIn PDF document text
    • https://service-panev.com/userfiles/mipabuke.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/rusiwasota.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/rabasukajig.pdfIn PDF document text
    • http://hidropro.hu/upload/81948915527.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/11550415751.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/26579238652.pdfIn PDF document text
    • https://shibbirs.com/media/files/vapaxipezodubavuwivifew.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/58734513141.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/35317414254.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/45759159501.pdfIn PDF document text
    • https://austarpharma.com/upload/files/menelutubafumikezuxinalu.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/23848839683.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/96353861858.pdfIn PDF document text
    • http://stonebreaker.at/xusovurevinu.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/4819923879.pdfIn PDF document text
    • https://tipresentoio.it/images/file/74800463565.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/vofimifonufujiredelademiv.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://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_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 19072 bytes
SHA-256: 341c8a4beb012df4f7a2809d84fa48b56dd4cafdab05c5e5ebd6427b8f318ac4
font_02_sfnt_off000120df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 11400 bytes
SHA-256: 4e9a7dad9e0f311f6bf4a41cf407283427dd7994cfbeafd0934a7209ce8673d1