Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e36dd2a1e4f5a9…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 17:55:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa743eb8c3635cf58d47f37852cfb2d7 SHA-1: 1a1cdf87a086e5470741129f0eb4b29d8f9c1274 SHA-256: 79e36dd2a1e4f5a9bfe2adaaf15506ea8607929704fab0b7d172610593c9b322
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used in link farms to manipulate search engine results or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful websites.

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://mezovuduw.ru/wix?keyword=warehouse+clerk+cover+letter+no+experience
    • https://puralabeno.weebly.com/uploads/1/3/2/8/132814071/monewiru_fowoke_jefiburedaj_lenipugapuw.pdf
    • http://palitra-cveta.ru/fojazanopijazofojagu20ca7.pdf
    • http://love-cosmetics.shop/13169798028ge5on.pdf
    • http://tuimag.ru/nuzovovuvug7u6gt.pdf
    • http://pagebake.com/fisamo10hui.pdf
    • http://betmoy54.com/xuvoxii9p9a.pdf
    • http://bloomwithdeanna.com/does_microsoft_office_2010_work_on_windows_xpjll8b.pdf
    • https://xovozenoz.weebly.com/uploads/1/3/4/3/134348708/kikurokusanoxix.pdf
    • http://bigtittybella.com/haunted_house_atari_2600_manuallcatl.pdf
    • http://bostpolamos.site/aesthetics_a_reader_in_philosophy_of_the_artsi270e.pdf
    • https://karuxuli.weebly.com/uploads/1/3/4/3/134377251/rolipamafuzofinu.pdf
    • http://abistrans.ru/292256018445q51c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_39979f6892a64c1899f37c05281a622f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0fd2cf10-a48b-4af8-8c5d-d8e91d75c91a/vukofagumesurimenaf.pdf
    • https://uploads.strikinglycdn.com/files/026840ab-9f96-49ee-b9e8-1c26908e397f/jemakikonetimosoj.pdf
    • https://uploads.strikinglycdn.com/files/7cb3c94f-1415-478c-b0b9-01f71b9924b6/20427106539.pdf
    • https://uploads.strikinglycdn.com/files/f5877af5-5d3a-451b-995f-bb19101a00c6/vegan_lunches_for_picky_eaters.pdf
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_6e46d3862dbe4c668dc917b248c9cc68.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9726c0c8-d132-4a6f-b13d-be4b34e6867f/bazirixawobamifejomew.pdf
    • https://uploads.strikinglycdn.com/files/38b57210-b7b6-443c-bb4c-12e166270757/daisy_powerline_880_pump_repair.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_off0000f506.bin
2d01533d6ae42bd14fc2637e79779cef484dce84a30541b77b3f0417721449ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 5228 bytes
font_01_sfnt_off000106d9.bin
5313a646292a0955ad3fb459cf46ed54722f9c8b58a0fc720e89a39a9329d833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 10720 bytes

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