Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da558afc7506d23…

MALICIOUS

PDF

76.5 KB Created: 2021-03-23 01:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49eb4b06ebd2f9c289f3cf2612193284 SHA-1: d38bde31883f118aa9506e0cc1c79cadae1c9116 SHA-256: 0da558afc7506d236c578aba0264612f1e9f50677c7bb3e5cfe86acf83da125b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, including one to 'mezovuduw.ru' with a 'ti+81+calculator' keyword, suggesting a lure to a malicious website. The presence of embedded PDF link farms further supports the malicious intent, likely to distribute further payloads or conduct phishing.

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://mezovuduw.ru/wix?keyword=ti+81+calculator
    • https://cdn.sqhk.co/takepoladev/ebtjhf4/fevawaliwewur.pdf
    • https://cdn.sqhk.co/kipezipilojo/lifgfgc/adidas_sweatpants_kids.pdf
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/b670388f8.pdf
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/fodovogovodugupales.pdf
    • https://kafiwixuvaso.weebly.com/uploads/1/3/0/8/130874495/8399681.pdf
    • https://piwevowukitibe.weebly.com/uploads/1/3/1/4/131454699/1345088.pdf
    • https://vasidigugadojo.weebly.com/uploads/1/3/0/9/130969577/4756587.pdf
    • https://fawitazekivaji.weebly.com/uploads/1/3/1/4/131454143/9587226.pdf
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5fd79b3abb594.pdf
    • https://ribebolavat.weebly.com/uploads/1/3/1/3/131398139/ae9958f.pdf
    • https://cdn-cms.f-static.net/uploads/4375889/normal_6054bf1fb20fb.pdf
    • https://gefidiwe.weebly.com/uploads/1/3/0/7/130738847/sivajureliz.pdf
    • https://suzuxagutif.weebly.com/uploads/1/3/4/3/134352905/00c35d4889df.pdf
    • https://cdn-cms.f-static.net/uploads/4480590/normal_5fdb0b3775507.pdf
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/nomodaputafo_rikarexari_zowejoviwizola.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xopugup/soliv.pdf
    • https://s3.amazonaws.com/musoxifuvitalo/gordon_leishman_helicopter_aerodynamics.pdf
    • http://zawofepak.epizy.com/19140890898.pdf
    • https://s3.amazonaws.com/luworizesupox/mahatma_gandhi_autobiography_in_telugu_free_download.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/59353119508.pdf
    • https://s3.amazonaws.com/dukavunivifa/vintage_hobart_meat_slicer_for_sale.pdf
    • http://nojumajemipi.rf.gd/staphylococcus_aureus_coagulase_positive.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_off0000ec9e.bin
b333f5329d4750db3b587c87dc58f5b569e36aeea2a72e41966b107645d4b575		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 4812 bytes
font_01_sfnt_off0000fd0e.bin
e19940add87b4591a0cb9717cabcd250866c65631654d885f5e1aa555934802d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 11368 bytes

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