Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fd01b9ce5fdcd7…

MALICIOUS

PDF

75.0 KB Created: 2021-03-19 21:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46b4714e4b9be3c535a4085c16ed2c80 SHA-1: b25d642bcfe08864c17d7b0cc58c86ce895ac174 SHA-256: 44fd01b9ce5fdcd7f1fe6716213ff1de8580b9f74495ded81990ab1c11283c25
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain ('soxebez.ru') that is likely part of a phishing or malware distribution scheme. The presence of a 'PDF_SEO_LINK_FARM' heuristic and a high ML score further indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=tax+refund+calculator+2020+uk
    • https://cdn-cms.f-static.net/uploads/4503035/normal_6049bb6bcc514.pdf
    • https://cdn-cms.f-static.net/uploads/4367305/normal_600ff32a4fa8c.pdf
    • https://static.s123-cdn-static.com/uploads/4393644/normal_5fc99b9f9642d.pdf
    • http://muvirire.22web.org/87718834923.pdf
    • https://cdn-cms.f-static.net/uploads/4410678/normal_604b3a62d6eff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kisimujuk/64423253969.pdf
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_6e380148e3a241c0aed7a5458201c6dc.pdf?index=true
    • http://fugebuxojawuris.epizy.com/86760250721.pdf
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_9523f64d8d77427692ec8711bc65ee4d.pdf?index=true
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_41291cd8d83f48e4a9cb5c7438a7f7cf.pdf?index=true
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_bf9ee55083a54f4aa390c82fcfc571a3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1b1668c4-30e1-4888-b115-3067a69201c4/73315969019.pdf
    • https://uploads.strikinglycdn.com/files/fb1fcf70-d711-4734-9747-63315f6c71d9/78265872786.pdf
    • https://s3.amazonaws.com/vukujidor/79869026129.pdf
    • https://s3.amazonaws.com/telasebisu/96220694586.pdf
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_ee93be923e984cff8741e4092cadf04b.pdf?index=true
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_aaf3d99fdf384293a92bde4375379793.pdf?index=true
    • https://s3.amazonaws.com/tajimipojimo/latest_windows_10_update_offline.pdf
    • https://b2691e05-be35-46d2-a26d-08c503de0475.filesusr.com/ugd/b15c0b_a38975784ee44bafbb2b815b2a871436.pdf?index=true
    • https://s3.amazonaws.com/putelekireza/toni_morrison_recitatif_audiobook.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_off0000e575.bin
403eef640a1ea057236dd8f61d66a82e146e438947c0ac7596c1111abe1cd200		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 5192 bytes
font_01_sfnt_off0000f736.bin
fac0c79c23ea424843ef04a452fb247a014074d4896d9c5a1badca1d5c426ce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 11272 bytes

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