Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf5e42c85270a2f…

MALICIOUS

PDF

123.2 KB Created: 2021-03-27 17:19:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8c0519f6e578f4cdc20a268d7c728e5 SHA-1: ee696c671a4e067d106351338ab267f67116b869 SHA-256: ecf5e42c85270a2f7ac17087fd558b0677017de56f7aee987cc0e6eee1c510a0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files hosted on various domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of an attempt to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/wix?keyword=nioh+battle+of+ohashi+bridge+drops
    • https://cdn-cms.f-static.net/uploads/4414871/normal_5fd9dcd032c3c.pdf
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/2073984.pdf
    • https://lemusovigezamo.weebly.com/uploads/1/3/1/3/131381045/rukutuvotikavan_xinap_walerolijor_vutolu.pdf
    • http://xemepuvaxeliv.iblogger.org/tofaxafi.pdf
    • https://cdn.sqhk.co/libavesonon/4fWTsij/offer_letter_format_for_buy_back_of_shares.pdf
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/xelexibutomekurifaji.pdf
    • https://cdn-cms.f-static.net/uploads/4477886/normal_5fe7f0397fb36.pdf
    • https://xalifabosivibu.weebly.com/uploads/1/3/0/7/130775217/8491850.pdf
    • https://cdn-cms.f-static.net/uploads/4366982/normal_60521fee9e541.pdf
    • https://cdn.sqhk.co/ruxagoxoman/vUiaid3/bhagwan_shiv_ke_bhajan.pdf
    • https://cdn-cms.f-static.net/uploads/4483839/normal_6044d6d7d5e6e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://runisinifozi.rf.gd/68137457663.pdf
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_76bbd7ec07624609a479fe4ce281af1f.pdf?index=true
    • http://sukifimogu.rf.gd/how_to_calculate_concrete_mixing_ratio.pdf
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_b5f79156efab41e59ee7282cba3c7b7e.pdf?index=true
    • http://waromewozepivo.rf.gd/52039005550.pdf
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_126f09e630b6426dbd1c876a75d53c32.pdf?index=true
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_e3658ee9b86549b7b32f27ba7600157d.pdf?index=true
    • http://rijuvijima.rf.gd/52363447732.pdf
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_d922b2504a6d4c72aad2b8bc401159e3.pdf?index=true
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_436f585472fe43ffb04616d903918845.pdf?index=true
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_cd704e78e2af46e38d814afdc1a1578d.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018a7a.bin
dbdb8c003f391ab6843d12fdb77754ef3b3f15291bb985f49d5b11d99c7a3f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18A7A 3008 bytes
font_01_sfnt_off0001953c.bin
cd202e7012bca436c4f96c8b41f2d4a0742690ae4a4d26c9f77de5bc31e53d75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1953C 5092 bytes
font_02_sfnt_off0001a699.bin
b926f80959d5f07e99eff79533d4c676dfaff4cb1f991a9630ae52bde6bfa14c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A699 12092 bytes
font_03_sfnt_off0001cf0c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF0C 4324 bytes

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