Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b630a4e11ccf8f…

MALICIOUS

PDF

64.5 KB Created: 2020-12-15 09:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: aa99050e24df7935eb7174fa1d835497 SHA-1: 91c1dba168f11c934263a01796edc9e1303120a7 SHA-256: f3b630a4e11ccf8f6ad4ee0dfa7f7a4cb7dff061916f8bc1caf856b3569bfa1b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffnew.ru/strik?utm_term=seussical+jr+solla+sollew+karaoke PDF link annotation
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/sefaritonos-nukivafeka-retisebop-regaxumex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_5fafee1b27ee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379744/normal_5f9a5f472b337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d7d21b-9fb5-44fd-b5de-8234a9b9def3/understanding_nutrition_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/44391515790.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/cashflow_101_e-_game.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/jasiweg.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/a_practical_english_grammar_exercises_1_and_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45880731-74d4-4f39-8ae1-03b3ac8bbd54/numiwavaro.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/honda_hs828_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/c_async_form_show.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/bejeweled_2_free_pc.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_off0000c13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13B 5128 bytes
SHA-256: 6037bbe7e3bd160906239bb5d4ff20f645a24fcfda777922a0fc11db241c76d2
font_01_sfnt_off0000d2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 10208 bytes
SHA-256: 53536170abc69f0b5368483429ff6983bf1487d20f2e40a8ef3b1426277b1ace