Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc13afb0c0aa7f0…

MALICIOUS

PDF

67.6 KB Created: 2021-02-10 04:01:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d3fe430f5e585c9e9596e7bb62bae720 SHA-1: 4b565ae9666f07334515703e127c4899e06be3ec SHA-256: bbc13afb0c0aa7f0974b5ca31e0649c1f01489a7de83a71f9b52d2b2794e8dd6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or SEO spam campaign designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to exploit users through web redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=beauty%20tips%20in%20tamil%20app PDF link annotation
    • https://cdn.sqhk.co/fejisedetu/5gjvPjh/59767419764.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/djcf7KW/island_defense_warcraft_3_reforged.pdfIn PDF document text
    • https://pumujeguda.weebly.com/uploads/1/3/5/3/135330988/demogikizuvijijapipu.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/igtjhsX/quick_dash_questionnaire_scoring.pdfIn PDF document text
    • https://dopozagipixa.weebly.com/uploads/1/3/2/7/132741545/vagifod.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/eidemTX/fortnite_mobile_controller_for_iphone_8.pdfIn PDF document text
    • https://losaburi.weebly.com/uploads/1/3/5/3/135322327/pobojinunokis-vapexapovewezit-wafatowowu-fuvapaxutij.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/eLjbCha/merge_dragons_event_keys_rick_and_morty.pdfIn PDF document text
    • https://cdn.sqhk.co/bazexolareja/0Kgcvgg/34028325451.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/MRUbxii/guess_the_song_game.pdfIn PDF document text
    • https://cdn.sqhk.co/nawafoxobok/jKVifhg/cosmic_showdown_apk.pdfIn PDF document text
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/liturok.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwonukunav/hgiirby/the_shield_archery_target_backstop.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/dihdhh5/jarolofazo.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/TSQVgco/12471725582.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/4093792.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/xoguwavosuje/a_c_c_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/chinese_keyboard_android_apk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE14 5020 bytes
SHA-256: 621da4670d44b3bb119a9a64325454201287bedfb73e601ecc6dc7c33df6ead3
font_01_sfnt_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 10076 bytes
SHA-256: a0e438c864e9b3a0fd340ae8a91f60fb645f2087e1f1bdb03cc3d7a9eeb867e9

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