Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca5ef790f17e5bf…

MALICIOUS

PDF

73.0 KB Created: 2021-02-24 23:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 884af0fd742319c0a1e8349f2e5ef2ad SHA-1: 56f90ed75a731566166c4e7df6794b47d6787d1a SHA-256: 7ca5ef790f17e5bf33d1a74dbc489b5540f9be29de3dbadd27cddd791adc18c3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://leonvi.ru/123?utm_term=how+to+reset+network+on+canon+printer', indicates a lure related to printer troubleshooting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites.

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/123?utm_term=how+to+reset+network+on+canon+printer PDF link annotation
    • http://bidizujimon.getenjoyment.net/tirirafusejavesubokowutep.pdfIn PDF document text
    • https://gilulunerokife.weebly.com/uploads/1/3/5/2/135296548/0b82c9a0775.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/c6hhifP/vukefavek.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/epson_perfection_v550_photo_scanner_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_60300b23d9e3c.pdfIn PDF document text
    • http://faruvob.iblogger.org/45210752028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480585/normal_6013889a3929b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_603009be9c858.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/cihZiiL/kinderpass_childcare_management_app_and_platforms.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/igm7ijL/sky_force_anniversary_review_switch.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/fourth_grade_fluency_passages_with_word_count.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/ev6W5eH/bojuwemirumutumerigararoz.pdfIn PDF document text
    • http://liwuzagesasa.22web.org/79384407247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulikoviluxugu.rf.gd/91812308620.pdfIn PDF document text
    • http://zekarevuwo.epizy.com/96553448219.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/guxexitesekelakekewazomej.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_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 5012 bytes
SHA-256: a706fbe7fc70ec0ca627b6c2e68f9f27828090e9e4c7e337ef2f5b0fdcf2ea42
font_01_sfnt_off0000f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 10680 bytes
SHA-256: 68d368e5f37dc29a1f5820fd037602bdb9880d74d6c97a5723956f66ee665ae0

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