Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bc27159abdfce0…

MALICIOUS

PDF

75.2 KB Created: 2021-03-27 11:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5593dbc8730f8cae5a11c1e8fce9e61a SHA-1: d6a1098a9959169bf97ae5e36069b2676b23e222 SHA-256: 64bc27159abdfce083f75006bf770e528ff4e5e64a0e2b5cf392ae0a5fb5271a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. One such URL is https://mezovuduw.ru/award?keyword=free+november+2020+calendar+pdf, which is presented as a calendar. ClamAV also detected this file as Pdf.Phishing.Trojan. The presence of embedded URLs and the link farm strongly suggest a phishing or malware distribution attempt.

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://mezovuduw.ru/award?keyword=free+november+2020+calendar+pdf
    • http://lapitubemexidi.mywebcommunity.org/89626679264.pdf
    • https://kamedewogivazu.weebly.com/uploads/1/3/4/0/134096977/2559581.pdf
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/lapan.pdf
    • http://circulshtangcalip.website/40641143442o7wno.pdf
    • http://accueilcmb.com/pamunuzejigofofopp1x4r.pdf
    • https://pawagidi.weebly.com/uploads/1/3/1/1/131164052/nepowexakamedasob.pdf
    • http://prizinsta.site/remujepx8xf7.pdf
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/f2ae89b.pdf
    • https://laduvozonos.weebly.com/uploads/1/3/1/4/131408864/mipuwokumoni.pdf
    • http://hytri.com/arayesh_ghaliz_shajarianyap89.pdf
    • http://retys.space/poxefxq3xz.pdf
    • http://karaulovlife.site/rosekakulodimzoxky.pdf
    • https://nobenala.weebly.com/uploads/1/3/4/3/134348336/bivam-vuxikibine.pdf
    • https://pubegole.weebly.com/uploads/1/3/0/7/130739090/9234669.pdf
    • http://vitetoka.scienceontheweb.net/add_subtract_multiply_divide_decimals.pdf
    • https://gumulopeviw.weebly.com/uploads/1/3/5/3/135348062/cd9d23fe.pdf
    • http://finomimetafix.sportsontheweb.net/23583205284.pdf
    • http://1yamal.space/orao_subordinada_substantiva_emgfuar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_289c082004774c9fa77b9400f7570a80.pdf?index=true
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_025b38cb658b49d59991a194ddcb9ec7.pdf?index=true
    • http://totuxivez.onlinewebshop.net/fitolasoz.pdf
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_6f5b7fc412c84768a6894a16dc787cd1.pdf?index=true
    • http://rabatelekovufar.myartsonline.com/sword_art_online_alicization_lycoris_coop_gameplay.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_off0000e915.bin
54ae0d5811b377e14cfddbb6d3956e5d2ea52099c87c05fc8538119062d8ba42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 5552 bytes
font_01_sfnt_off0000fbe2.bin
b79388ba8f13fe2e161ad84d818564293dc9e4a01f2204d2ca1388067cd3eb13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 10420 bytes

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