Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30297d3802d24f9…

MALICIOUS

PDF

85.6 KB Created: 2021-03-20 16:56:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ba1b2e0bb76d4defca0653bdf3fea59 SHA-1: e260d7ae8058ba6af17815be632f86a9c2fc9919 SHA-256: b30297d3802d24f9c7e38bd0ee5287f00d0e41d8b887e5582bd7741dfb35ff7d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains a large number of external links, with one suspicious URL pointing to xezojetit.ru. The document body is heavily obfuscated, but the presence of numerous external links suggests a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+much+hp+does+a+zx10r+have
    • http://jefevivavifax.scienceontheweb.net/how_long_does_it_take_to_count_to_1_thousand.pdf
    • http://xolokukifimiv.sportsontheweb.net/82026139062.pdf
    • http://letilemugemin.66ghz.com/the_empire_of_rome_worksheet_answers.pdf
    • http://sijubuwejipamun.mywebcommunity.org/developing_effective_listening_skills.pdf
    • http://derifupiwa.mypressonline.com/books_by_pastor_chris_oyakhilome.pdf
    • http://wusozupu.mypressonline.com/edexcel_igcse_biology_notes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_db1fc5b847044b02a27b009124409aa3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/861a247e-7c6b-4c4a-8091-1fe615ffcd04/como_trabalhar_nos_eua.pdf
    • https://uploads.strikinglycdn.com/files/1cfa23f8-0f5b-433e-b0ed-a03b4e940eca/six_easy_pieces_math.pdf
    • https://uploads.strikinglycdn.com/files/e517042d-2ac7-4fd9-9d48-d06c12253966/catcher_in_the_rye_chapter_12-13_summary.pdf
    • https://s3.amazonaws.com/luborinizu/59410619087.pdf
    • https://uploads.strikinglycdn.com/files/10a39fea-e49b-4551-b977-2e9b232dff3c/how_do_you_fix_a_craftsman_lawn_mower_that_wont_start.pdf
    • https://uploads.strikinglycdn.com/files/128c4033-dba8-414e-9e15-ebc22e14e562/51417038378.pdf
    • https://s3.amazonaws.com/xeroguru/zudidigomixebo.pdf
    • https://uploads.strikinglycdn.com/files/66ed93a4-eff8-4751-b90f-d8a1d3658ede/79279926324.pdf
    • https://uploads.strikinglycdn.com/files/3118a44c-9ece-4828-b4ed-2ae21f9c08cc/2137848078.pdf
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_e2117ac02f4c482aa61b3c5468c3392b.pdf?index=true
    • http://zomimuju.rf.gd/tree_diagram_probability_examples.pdf
    • https://s3.amazonaws.com/tidigudetefumof/hallmark_unleashing_mr_darcy_sequel.pdf
    • https://s3.amazonaws.com/gupawupigawono/24146842892.pdf
    • http://vezexosewomex.epizy.com/88549079006.pdf
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_88940375968040c8a172766b52b3182f.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f997.bin
f93a9676ff5f34de1b287ef2a7117c787820434b45535040237c0d745d66abb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 5708 bytes
font_01_sfnt_off00010cf8.bin
8f918726ca24b66ba13f01f3541274863dba759e0a5775a57c94d5d47a40f0a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 11200 bytes
font_02_sfnt_off00013356.bin
9900a2061f4db6d5851a1fb623229e1c91a1f2215fec638d1e55d9f0c32ecb7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13356 16088 bytes

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