Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f6877340de9347…

MALICIOUS

PDF

81.0 KB Created: 2021-03-21 04:16:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d036f6372afd7094bcdbb87b06342462 SHA-1: 790a1c892cdff36085bbf8b27c2503e7e8803ba1 SHA-256: 26f6877340de9347c71a65d9a6a9351ae5ea4d0197ffe2d67fa03fb6a517df18
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM point towards a campaign to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/wix?keyword=a+christmas+memory+pdf PDF link annotation
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/5098518.pdfIn PDF document text
    • http://blancop.xyz/dish_wally_remote91xxv.pdfIn PDF document text
    • http://idem-peshkom.ru/13508386583hxd4f.pdfIn PDF document text
    • http://mon-cmso.best/150744404776wupy.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/22023261980dwbsp.pdfIn PDF document text
    • https://dixodenifafazud.weebly.com/uploads/1/3/1/8/131856669/d02e12.pdfIn PDF document text
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/4c30d56ed88.pdfIn PDF document text
    • http://free-at.pro/liwonajebapozabodmk13c.pdfIn PDF document text
    • https://vurozagagi.weebly.com/uploads/1/3/4/6/134695821/8948213.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/holmes_eco_smart_heater_towerxmxeg.pdfIn PDF document text
    • http://mishabelle.ru/lewudirawuwasenoza2q89k.pdfIn PDF document text
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/9145525.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/4829d801-e6e4-4561-b7dd-4a5698b5c43e/how_do_you_program_a_clicker_universal_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11609637-54a6-4f43-9119-61b0095369f8/toy_scale_size_chart.pdfIn PDF document text
    • http://zimakufupakafor.rf.gd/stephen_king_it_2017_book_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00af8e8-f70a-482f-9de7-7291f3d34673/6604820114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/177b2834-6b5f-44a8-90a2-c12d5c57d9dd/psychology_of_religion_and_spirituality_graduate_programs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7291df1d-ddb9-47f4-a50d-2c1cc7423b09/jesijikesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0dbfcb-2901-4515-bc80-25917285ecb5/vubaravifuwelugeled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36410e9d-77af-4f95-af97-d0ece6f910c1/how_to_cite_online_sources_apa_style.pdfIn PDF document text
    • http://jesebikalag.epizy.com/xatuvina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a582dfd-2b37-48a7-bc8a-13274c81fec6/20920924106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f054a6-1337-4f2e-95d2-9d8bb7af2334/jowinaramoxomepus.pdfIn PDF document text
    • http://fojodopid.rf.gd/christ_the_king_college_uniform.pdfIn PDF document text
    • http://tobilekapew.epizy.com/82538828661.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_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 5456 bytes
SHA-256: 58a284f1f504fecc1f77e9c9775db586f2bdc9f6758033acf5e23d4e01d3fe00
font_01_sfnt_off00010f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 11576 bytes
SHA-256: 656b549807b6dbc38878910a9ee28d171a9ef5fecd1571490cdd2d1f3b275d5e