Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cebe0117dab5755…

MALICIOUS

PDF

76.4 KB Created: 2021-03-09 01:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4dbf5744c3d9c0061d311b818ce7542 SHA-1: edad0306b5bc74d20a7bec5d24be4b021e90cd0c SHA-256: 7cebe0117dab57553733bd026afcd3281326911777513821769477c0e320f10e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://midufefew.ru/award?keyword=cdl+practice+test+ohio+pdf, which is likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=cdl+practice+test+ohio+pdf
    • http://tekabufoj.22web.org/combat_sports_commission_annual_report.pdf
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/xufuwa-vexukuko.pdf
    • https://cdn.sqhk.co/rawejefipemi/khhigb2/vuwabunukojubexivusi.pdf
    • https://mowavowami.weebly.com/uploads/1/3/4/5/134591552/zixirosu_nusafafomexi_zanakujimawej_romixuluxutod.pdf
    • https://nunibuzobaga.weebly.com/uploads/1/3/0/7/130740367/3460503.pdf
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/1744580.pdf
    • https://cdn.sqhk.co/bomoxale/cgfjccY/pejuwamifaresukop.pdf
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/1cd89a6154e90.pdf
    • https://zaxewunatomilar.weebly.com/uploads/1/3/4/1/134131499/5879239.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_2e8e540e24be43018bf2df314ba07f9b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1ff1f7b4-296b-40cb-b66a-af89883a73d5/52724613344.pdf
    • http://pitowurojagit.epizy.com/husqvarna_445e_ii_18__50.2cc_gas_chainsaw.pdf
    • https://uploads.strikinglycdn.com/files/d0db678b-2739-44f8-b7c3-9a2b62761fb8/historically_disadvantaged_groups_canada.pdf
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_917169f5fb7e4412b7a729a8041b8777.pdf?index=true
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_fa999ffffa4642d995c8d0a16647f293.pdf?index=true
    • http://gujupikisikali.epizy.com/lee_co_va_sheriff_s_report.pdf
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_2f6e7ffe3dc44cbaac63e12b2e404e2d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3def0060-2c64-42d7-b0e0-1f31f74bc9a7/39189325453.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e149.bin
aa681b53310946d12983b4fd954a3352408961a7c9f6d5761b708cefbe570864		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 4948 bytes
font_01_sfnt_off0000f230.bin
ec1c2ab6062db15ddbebde6798f1d878fed1a0daf7a7f98988ac21ecb273ded9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 10640 bytes
font_02_sfnt_off0001169c.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 4324 bytes

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