Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1277516aadd8ea…

MALICIOUS

PDF

82.5 KB Created: 2021-03-21 10:23:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b73985e154b3c1c19475575a0286a3a4 SHA-1: bf4a680dfb264d63e580713394f8f7d795c39d4a SHA-256: af1277516aadd8eadca1cd8289d59b284e214c8706bc134e7e01b630eb5d6c45
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to a suspicious domain ('jottigo.ru') that is likely part of a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jottigo.ru/123?utm_term=cinderella+cartoon+story+movie PDF link annotation
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/5012896.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/HjjgNgj/download_maps_of_clash_of_clans_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/fadanade/XusklNo/87761056701.pdfIn PDF document text
    • https://lazekikobetilof.weebly.com/uploads/1/3/4/4/134443651/3aaa0902e60a9.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/046f288f.pdfIn PDF document text
    • https://ganegekisawaji.weebly.com/uploads/1/3/1/4/131406809/9b3e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/drum_music_sheet_easy.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_90cb1c11d173476f94f3fabcff28d832.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wusone/carvel_ice_cream_cookie_cake_nutrition.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/guitar_basic_chords_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/57435718846.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/kozufevipofunel.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_b4c3113979404baf8343d12a2da6df56.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupebesu/60595357361.pdfIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_97c66185a0564d10b3e0e22163873168.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 5152 bytes
SHA-256: 63df952ebf908c3797edc2d56816d2ba4f95ee079e00358502312681572d6332
font_01_sfnt_off00011723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11723 10804 bytes
SHA-256: 78550cc91bfbf837cf39ac67ad2e679126f0d469bab56a55c069d613b7f39873

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