Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab709da90bd92c17…

MALICIOUS

PDF

92.6 KB Created: 2020-11-14 07:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9e9ffd8fc63e3cdf8fd3b4f3d4950271 SHA-1: 60a5ba34f77ebdfab30bff54a3ad4f2e0733e28d SHA-256: ab709da90bd92c1712bf9f50ca83d2b385a308bcda643ce7727bf4259abe47c6
164 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/123?utm_term=rtl8191s+wlan+adapter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5fa9c97f19c10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5f91f4d62cbfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388420/normal_5fa30e645ce86.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/mivomedabubos.pdfIn PDF document text
    • https://wojazaxu.weebly.com/uploads/1/3/4/5/134589930/jalude.pdfIn PDF document text
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/fizupavafezoven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5f9b1cb3b80db.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/wazotojemov/skinny_freezer_pops_where_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ff8113-9c9f-4789-ad45-8e9d09580f5c/lunilajav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fcea25b-603d-4f9b-a87c-bba51a291ac6/oracion_a_san_judas_tadeo.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_off00012df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF0 5456 bytes
SHA-256: 7f8ad8cae82ddd4202cf871b39b14aee400def61603584ac7712ba860cee0966
font_01_sfnt_off000140a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A2 11036 bytes
SHA-256: 147b6327d3a472a16af6eea2c3ea5cb15179659e4c5c1fd5e1d2fdb8a939dd0f

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