Malicious PDF — malware analysis report

Static analysis result for SHA-256 840ffda1627a7309…

MALICIOUS

PDF

66.2 KB Created: 2020-12-09 22:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0df5b565a436c86ed1d8ee25dd8c880a SHA-1: 2c7554b8f88cad55273840c3c0a1777809fb5869 SHA-256: 840ffda1627a7309880156bc0596e9b4ed3fba5dabe78a400af4d155c908196d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://trafffi.ru/strik?utm_term=monty+python+last+supper+skit', appears to be a lure for users searching for specific content, potentially leading to phishing or malware distribution.

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://trafffi.ru/strik?utm_term=monty+python+last+supper+skit PDF link annotation
    • https://zefufewik.weebly.com/uploads/1/3/4/3/134374544/0d79875.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/6224353.pdfIn PDF document text
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/4ace7c309735e7.pdfIn PDF document text
    • https://kelabuwak.weebly.com/uploads/1/3/4/0/134098394/lavowonukogulofu.pdfIn PDF document text
    • https://kikosubulu.weebly.com/uploads/1/3/4/8/134884397/luribuvobojibikuku.pdfIn PDF document text
    • https://renexiba.weebly.com/uploads/1/3/4/8/134895383/dagawijobisasi_zivid_werewunemamuvin_bidotowifiw.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/ravowibuzewujeb-sefeputi.pdfIn PDF document text
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/momasewoxiruxaj.pdfIn PDF document text
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/6d1d46a9ce1.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/20abac54-1b12-41fb-bcb1-87ef29b99493/thai_ridgeback_dog_puppies_for_sale.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36b9c403f5353fda5c89f/t/5fd11421dea8e17a36fa4bcc/1607537698388/new_warrior_cat_books_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338197fa-479e-4430-a23f-9b3bf1dcc5eb/xubukajafewupowaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a7deb7-1f0d-43c8-89b8-367d390a9992/81770688585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f732f6bb-7386-4536-ad06-635617f4e601/wifenuvilobimokopowin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e08fe95-fa1f-479f-95ff-9da777ddef25/zosakudifesagupite.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_off0000c521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC521 5080 bytes
SHA-256: 0079a75a5d56ee04593ad8065b6be6a1fbb33efc07354637ebcfb19bae1bd53a
font_01_sfnt_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 10984 bytes
SHA-256: 8232bed24a2c824aabc7258704c7bc9b6b678365575fd750c8365990c9e965ae

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