Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08537445b5920c3…

MALICIOUS

PDF

91.2 KB Created: 2021-03-15 09:21:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21922d35a9d0867b8ce3ed44a5125791 SHA-1: df57d70bf50c4d67c6258eac7c92695b90f03ef2 SHA-256: b08537445b5920c34bc577f9ff6ff220efc159be79fea7d744c261ef98801dfb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, with one prominent URL pointing to a suspicious domain ('crophysi.ru') that is likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to 'buyer persona template pdf'. No scripts were extracted, but the presence of multiple external links and the overall detection profile strongly suggest an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/award?keyword=buyer+persona+template+pdf
    • http://balonedud.iblogger.org/asbestos_roof_sheets_risk.pdf
    • http://reduslim-italiaoficial.site/zixelipufitejofosaxixo7ef7k.pdf
    • http://reactivaperu-2020.com/what_is_the_best_university_in_washingtonmnqzr.pdf
    • http://tajavimisafom.22web.org/analise_swot_conceito.pdf
    • http://malespw.xyz/wevejavago7aa65.pdf
    • http://rawenspant.online/92206354206wqauw.pdf
    • http://freehookup.xyz/76993959553ug155.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_80802da3f5b4406f8f03c96e7c0943d8.pdf?index=true
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_b877c24e7497487cbc9a78a97678efc8.pdf?index=true
    • https://s3.amazonaws.com/rexogeguxosix/winrar_latest_version_32_bit.pdf
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_4c42118be0ec4bfc8a304aae775549de.pdf?index=true
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_d39b413ade5e42a281e8c3e6e49a4462.pdf?index=true
    • https://s3.amazonaws.com/pibajuwi/ieee_template_font_size.pdf
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_53abcd2743034edc9cb453464818e830.pdf?index=true
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_6273c387a8fd4df892bcd7072d6c3903.pdf?index=true
    • http://jowofosepenomun.rf.gd/58211930889.pdf
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_75272c9de19848619bf72865d32cbebc.pdf?index=true
    • http://vikogen.epizy.com/inline_style_sheets.pdf
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_e474e6d7c5454df8bd4b544c3d93c6f8.pdf?index=true
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_523e65b90b7b4d86ad6146efe7ac82b4.pdf?index=true
    • http://xuvafojufiwel.epizy.com/gimagopebegoj.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_off0001148d.bin
15351fc3e658adc4d8fe86bdbbd32baa69cc45d32aac88e8ef8314a49789a367		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 5336 bytes
font_01_sfnt_off000126a3.bin
26aa4e78ff93e688c4fa264a85130ce371325fd73c9e7c5b6024c8241f4ddb9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A3 4824 bytes
font_02_sfnt_off0001386f.bin
ab16c9f78b9a6f356461cf95a7fdc0113f96f48d96e1fdc633cf801fa790a367		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1386F 11872 bytes

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