Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e2399b9994ecbd…

MALICIOUS

PDF

76.0 KB Created: 2021-04-03 03:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 16f61b3143a896738826563d16a4a76f SHA-1: 767aafa753ef9d3c554b4ee90d15a6b979502712 SHA-256: 44e2399b9994ecbd9ad043af4da9fd3418f1b381766ddd1dafea90b210249be1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning attempt. One of the embedded URLs, https://leonvi.ru/strik?utm_term=reasons+why+we+should+not+recycle, is flagged as unknown reputation and is likely part of the malicious infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=reasons+why+we+should+not+recycle PDF link annotation
    • https://fezimadi.weebly.com/uploads/1/3/4/4/134487715/jizetesuxodadejijako.pdfIn PDF document text
    • https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/1010389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421062/normal_5fdd9447327a0.pdfIn PDF document text
    • http://italysummer.fun/53759700273hu2g0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_601463344010c.pdfIn PDF document text
    • http://begemot.space/5571460103dwt9q.pdfIn PDF document text
    • http://khareedforosh.com/what_is_a_good_name_for_a_grey_horsezb3tn.pdfIn PDF document text
    • http://ru-order-687646765445.art/gikugelirewps2z3.pdfIn PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/cf52c9896c774.pdfIn PDF document text
    • http://maslovauto.ru/98269142100us4sj.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/kefiperizonofu/barbara_taylor_bradford_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/35639565452.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/31641523717.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/auditing_and_assurance_services_7th_edition_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/pablo_neruda_sonnet_17_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/evenflo_car_seat_base_embrace_35.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/ethical_hacking_jobs_salary_in_india.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_bd29e9b698df4116bcfe16c9fc448e9b.pdf?index=trueIn PDF document text
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_e1fd20d845b34fcfb0a1d11ce0bc2359.pdf?index=trueIn 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_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 5228 bytes
SHA-256: e6612d4404233bbe25386052a09301a1eedd1a1c66be31795ce9b210ab37d940
font_01_sfnt_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 10384 bytes
SHA-256: d9b97ae573d7748224579267a2a0ff51764b0a2fa4413945ef21515d52b96ea4

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