Malicious PDF — malware analysis report

Static analysis result for SHA-256 44339cb5c93673ea…

MALICIOUS

PDF

77.1 KB Created: 2021-02-18 17:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9f42df3cc4aa8f742d93dfd3adde9050 SHA-1: fd2a1eaa9a0165cbcbbbe60af446a99dc72920ad SHA-256: 44339cb5c93673eabf3aa989bedc8cbea2f6a304029663be0b73f47187ffeea6
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable domains and appear to be part of a link farm. The document body, though partially corrupted, suggests a lure related to writing a book summary. The presence of a PDF_SEO_LINK_FARM heuristic firing and the ML_NYX_PDF_MALICIOUS score strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and numerous external links are indicative of a malicious campaign.

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://leonvi.ru/strik?utm_term=how+to+write+a+book+summary+for+college+example PDF link annotation
    • http://tokio-2020.fun/radutewonem959oz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460446/normal_60277f88251fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_6026fdea06c17.pdfIn PDF document text
    • https://bedexupef.weebly.com/uploads/1/3/0/7/130775630/vomitexozarikow.pdfIn PDF document text
    • http://fiduvizowema.iblogger.org/55742074977.pdfIn PDF document text
    • https://jasoveloxera.weebly.com/uploads/1/3/5/9/135967924/3693810.pdfIn PDF document text
    • https://petodudugagakot.weebly.com/uploads/1/3/4/6/134640630/xorojavopinuw-kigumetipigefi.pdfIn PDF document text
    • http://all-system7.club/automatic_mouse_and_keyboard_fullgu90n.pdfIn PDF document text
    • https://vexikolilugurud.weebly.com/uploads/1/3/1/3/131379290/4837359.pdfIn PDF document text
    • http://avtoshtorki.shop/biotic_environment_includes_mcq97y9b.pdfIn PDF document text
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/b335f9f64771697.pdfIn PDF document text
    • https://fopabitibomasad.weebly.com/uploads/1/3/1/8/131857723/5194513.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://segisubab.epizy.com/digif.pdfIn PDF document text
    • http://katewamopexo.rf.gd/vudejibafaxu.pdfIn PDF document text
    • http://tunadupiliv.rf.gd/jrcalc_guidelines_book.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_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 5764 bytes
SHA-256: c187cb01a6a09d43128c9479ba31198f69beed9517b403db9ca84ad3f1febbaa
font_01_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 9904 bytes
SHA-256: 6e54e7af4800bbd1f1257d1be14246aeaa22dd2deb4e06c52606d37f8d8e32f7

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