Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27bd0a8f2627523…

MALICIOUS

PDF

78.6 KB Created: 2021-03-24 08:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d7642eea75bdca412674c313946ec0b SHA-1: 5a564b89c318262d977de92e85836280df868621 SHA-256: d27bd0a8f262752363faaebabb9e604219c8942705eac56905718f31c2f72a0b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a significant number of external links, with one identified as a potential lure for SEO manipulation or redirection. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to exploit users through deceptive content.

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://xezojetit.ru/123?utm_term=construction+project+management+template+excel
    • https://static.s123-cdn-static.com/uploads/4411490/normal_5ffb08c7c8c9d.pdf
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5ff76415eb7c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_b63f0b808bd8488394a19b38d368666e.pdf?index=true
    • https://s3.amazonaws.com/rimejiguvif/fedramp_p-_ato_management_and_revocation_guide.pdf
    • https://s3.amazonaws.com/tiduro/arabian_adventure_1979_full_movie.pdf
    • https://s3.amazonaws.com/midipes/21389959320.pdf
    • https://uploads.strikinglycdn.com/files/2c57b792-85eb-4c13-9ba0-69676d843b04/luparumufopidiluvogul.pdf
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_65b9722ae3b54d44b289b0efeda2d583.pdf?index=true
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_7a7a9463c29d4e4dbd52b4c6657ef7cc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c6840fa-3c3c-47fb-83dc-e0f549d56662/briggs_and_stratton_675_series_power_washer_oil_change.pdf
    • https://uploads.strikinglycdn.com/files/7d6d6d57-411b-44a3-8c76-a6e10f656638/how_to_say_hello_sign_language.pdf
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_e5f2cb6e20c94211b996c126c20e84e7.pdf?index=true
    • https://s3.amazonaws.com/mexavofezoxi/castle_crush_mod_apk_unlimited_gems.pdf
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_a48deff6908342fbb7b33f457e05beb2.pdf?index=true
    • https://s3.amazonaws.com/tedowafomaru/cs_lewis_the_problem_of_pain.pdf
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_17d91bcec325494b94cc540c53e81187.pdf?index=true
    • https://s3.amazonaws.com/lebejos/10732245394.pdf
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_3e48e94a9df1430ab4e5ed783c5d4138.pdf?index=true
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_ff4dc4c188264a7c9f3fb74f0562b0bc.pdf?index=true
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_bf363584af094a119dad0a1490111969.pdf?index=true
    • https://uploads.strikinglycdn.com/files/625f8ff9-8a66-4596-8a18-e52c6bad0844/51899223544.pdf
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_7c0c234b1ba9467c838c6853a5ded615.pdf?index=true
    • 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_off0000f606.bin
e3e336f81207c260bfb572e41b9d78a3bfac8cffd84700525d78c7d7abfa5007		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 5300 bytes
font_01_sfnt_off000107ff.bin
e1f284a88d85dafc250c162c8442d2147e6f9197eab3ba5ca0fcb87b98775222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 10832 bytes

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