Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73c52271514aeb5…

MALICIOUS

PDF

77.7 KB Created: 2021-05-26 21:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ca85d44d63109d661d9973d3122bb47d SHA-1: dab16da83c7347aeda58aa22b7f719b4c3aa75f1 SHA-256: a73c52271514aeb5688bdc034f11b71b7e5319e86072162e524d0d3386ed0ee7
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=how+to+install+amharic+keyboard+on+windows+10 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451566/normal_5fe53a9b19d70.pdfIn PDF document text
    • https://kavivafome.weebly.com/uploads/1/3/2/7/132740637/76aff5c611ae16.pdfIn PDF document text
    • https://wubepina.weebly.com/uploads/1/3/4/7/134721378/jubujuwabi-dexawefo-ribowujovidis.pdfIn PDF document text
    • https://kimidagox.weebly.com/uploads/1/3/4/4/134470984/ab70af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_6034fd7c94efa.pdfIn PDF document text
    • https://lulogozikojag.weebly.com/uploads/1/3/1/8/131858975/xugevulelotago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_601daeb06a113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_601532bbdc7fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413702/normal_5fdb5e0f3db29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459780/normal_600298f37c8e3.pdfIn PDF document text
    • https://lowizozexide.weebly.com/uploads/1/3/0/7/130776176/59f52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_601da47e3cb90.pdfIn PDF document text
    • https://toneditikam.weebly.com/uploads/1/3/4/6/134683764/12e1ceba3cbe5cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486350/normal_605f861228be3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_60318553cde83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420767/normal_60146ff0cd418.pdfIn PDF document text
    • https://wajuzetixageg.weebly.com/uploads/1/3/0/9/130969085/vuwarakugavapomej.pdfIn PDF document text
    • https://kolabobinojojiv.weebly.com/uploads/1/3/4/8/134880551/xopadog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_60251ea8a1e9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471512/normal_5ffae443c6eef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 5732 bytes
SHA-256: 8f20aba1faad46f7300d04b3c2a6769b18a2ad2ac28328e26298bfe793458202
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 11304 bytes
SHA-256: 266f1c0c4b767eac3df3f7fd8b46b1a27bd349f8233282595c76dd8798d46912

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