Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4a99f096b33858…

MALICIOUS

PDF

83.8 KB Created: 2021-05-23 21:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3bb892a2a6053517d59137b72b410f64 SHA-1: 5e0a8fb8b670263a3473c43e6b31d19a79230eb1 SHA-256: 4c4a99f096b33858d0d8b094ca60f7478eaa3a72c0d3c452b00e0b3d482a76ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/strik?utm_term=19th+century+literature+features PDF link annotation
    • https://tokuzulovaw.weebly.com/uploads/1/3/0/7/130740221/4900265.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/9218115.pdfIn PDF document text
    • https://nodajalij.weebly.com/uploads/1/3/5/9/135990600/6bb3cc.pdfIn PDF document text
    • https://tikobivit.weebly.com/uploads/1/3/1/3/131382680/fomowexe.pdfIn PDF document text
    • https://kizegugiruliti.weebly.com/uploads/1/3/4/7/134729255/vakij-buzuxojokobo-topedijavigiju.pdfIn PDF document text
    • https://kawavaturitavo.weebly.com/uploads/1/3/5/3/135321378/dujuxuvi.pdfIn PDF document text
    • https://xazegonegexedej.weebly.com/uploads/1/3/2/6/132683071/5170716.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/fevumokafuwolux.pdfIn PDF document text
    • https://taxinureku.weebly.com/uploads/1/3/0/8/130814469/9081741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/butowizalogizatamur.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/how_to_use_zxing_in_android_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7843f57b-2861-464f-b42c-affb6c80c0eb/why_is_my_dyson_v11_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/44839431206.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/bhagwan_ka_photo_hd_mein.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/sharp_portable_air_conditioner_ion_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e87915-b1e7-4c32-99ae-a24715df882c/dudubupaburizoxamef.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/facebook_recovery_account_email.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/vodidagubagejidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d8097a-fb81-461d-ba4b-e3e96ce6dd95/luzem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187358a5-c69a-4960-a57e-7480856dfaab/nimasoxadakez.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 5184 bytes
SHA-256: f7d873307a7d72edf9d8cba7cbed8bd55b2a0b046e4aa1a85e578abf90ded16c
font_01_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 10996 bytes
SHA-256: 9dab64248c10bedaa9017117889fe206e185b13cd21718f4cd5321553c27f5a5

Open this report in the interactive analyzer, or submit your own file for analysis.