Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a52f36aef190cb1…

MALICIOUS

PDF

81.7 KB Created: 2021-03-16 11:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52fcac392df6ad91e5cfe3a257c17da2 SHA-1: b9a3b15e4cf3311627fb9c272552b39999d55d86 SHA-256: 0a52f36aef190cb18eab2351334aaf1a6d47472096985d827be9312703b5167c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to the presence of a mass external link farm, with one URL being 'https://zajinet.ru/strik?utm_term=what+is+post+acute+withdrawal+youtube'. This suggests the document is designed to redirect users to potentially harmful websites, possibly for phishing or SEO spamming purposes. No scripts were extracted, but the PDF structure itself facilitates the malicious linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=what+is+post+acute+withdrawal+youtube
    • https://cdn-cms.f-static.net/uploads/4454287/normal_601f92672c81a.pdf
    • https://cdn.sqhk.co/bizujutenifo/ifJhdhf/snow_trailers_for_sale.pdf
    • https://static.s123-cdn-static.com/uploads/4427287/normal_5fe231a4ef7c6.pdf
    • https://cdn.sqhk.co/jaselavujuwi/9hj4jeA/electric_guitar_chords_tutorial.pdf
    • https://cdn.sqhk.co/rewazexi/rZhjjgp/painting_ideas_easy_on_paper.pdf
    • https://static.s123-cdn-static.com/uploads/4374175/normal_60049dec15a7d.pdf
    • https://cdn.sqhk.co/zogobadakedu/iehghdn/49139259848.pdf
    • https://cdn.sqhk.co/wigalefu/cLjeyMH/fleece_bed_sheets_tesco.pdf
    • https://cdn.sqhk.co/dosazuleg/ahdiiwY/13932890251.pdf
    • https://cdn.sqhk.co/tejurorado/jibgjhe/zarawusaralifozu.pdf
    • https://cdn-cms.f-static.net/uploads/4408858/normal_60339e8e0fa48.pdf
    • https://cdn.sqhk.co/goxupolofodi/hfidsie/26568349948.pdf
    • https://cdn.sqhk.co/basunemavut/W2c9hbo/how_to_hard_format_blackberry_z10.pdf
    • https://cdn.sqhk.co/jipodipotaj/dnhdgd2/wiloraremelonekifivanep.pdf
    • https://cdn.sqhk.co/virurewev/AieS6ia/matriz_foda_concepto_segun_autores.pdf
    • https://cdn.sqhk.co/zuxosutuku/fJqiiWF/lemufedanop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_8e77d7a5dbf44c28bc2a851c2d99e29b.pdf?index=true
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_ae66f06849594a389eb90a0c75ef4381.pdf?index=true
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_3d6c9e314504449d89614acfd2638fda.pdf?index=true
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_08004e9472284ffa9a9e0ed5956a5233.pdf?index=true
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_77bf8528e25e4efea1f5b73bb9ef88d9.pdf?index=true
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_e92c08318dc540f2883b72c607bf870f.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed49.bin
58906a90d21d0c895d0d7174fe5d508e348de1de9ccd99dc7588642662365fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 5508 bytes
font_01_sfnt_off00010014.bin
d5e868cd72c189e03db22137c7f8311de1b9732df6cbfbe35026bd7f646bfeab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 10424 bytes
font_02_sfnt_off000123d8.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 16204 bytes

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