Malicious PDF — malware analysis report

Static analysis result for SHA-256 a745b413690508cb…

MALICIOUS

PDF

67.1 KB Created: 2020-12-14 10:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: eb5a34caf51cc802768671c8df0e0729 SHA-1: d806880f8613404aa94fc333779ca09ffa386793 SHA-256: a745b413690508cbfae9f8cf42bbfba73ac71e4522fc9f0f5ad9ae01b6863b8e
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 0.9998

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.
  • 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://traffine.ru/123?utm_term=jan+ernst+matzeliger+fun+facts PDF link annotation
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/tanoxutomulevi-nojagodadu-leripaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500678/normal_5fb03b683ed5f.pdfIn PDF document text
    • https://fowalafe.weebly.com/uploads/1/3/4/7/134722097/5832370.pdfIn PDF document text
    • https://vomujozirokino.weebly.com/uploads/1/3/4/3/134318601/xexor-tilakanixozeg-vipuzurox.pdfIn PDF document text
    • https://zekorawuj.weebly.com/uploads/1/3/4/8/134862422/a0557.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/8498369.pdfIn PDF document text
    • https://safanopoxave.weebly.com/uploads/1/3/4/4/134461162/b8d97.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/fepakiper.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/tixedujegibex/26251145559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/062278e6-05ce-4d66-a574-7176fe423af6/natobusajakej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed0b9a59-6be3-4dcc-87c3-b7173a1790c5/62149383006.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_off0000c806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 5240 bytes
SHA-256: ba1cd21f1b47e931afce99bbf824faa05b3c8a60cc41dd1581549dad90183fd2
font_01_sfnt_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 10708 bytes
SHA-256: 630aabf52f0f544f9ba5b217670b7801413b7b35415b5a564baa1c99c8e11fb4

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