Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fef615b084d4c2…

MALICIOUS

PDF

70.1 KB Created: 2021-04-22 09:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 33189891a114ea7ecfdac84aea726edf SHA-1: 2016adeb7c6920016f297a8cfa23cf31b2203518 SHA-256: 10fef615b084d4c20d7a4fd6638f8cdac8358b2a2e08a91f30b78bd145f760c0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a high concentration on disposable hosting, and a specific heuristic identified it as a link farm. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=is+the+moca+test+free, which is likely used to redirect users to a phishing or malware site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=is+the+moca+test+free PDF link annotation
    • http://vilurusunus.22web.org/braun_thermoscan_7_irt_6520_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_604ec2d6aa125.pdfIn PDF document text
    • http://amsidisi.xyz/mupabibipogimetjaxpm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410722/normal_5fe356b52a6d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418399/normal_5ffd20d250885.pdfIn PDF document text
    • http://migazezi.iblogger.org/78533086440.pdfIn PDF document text
    • http://soxezujep.iblogger.org/54500461078.pdfIn PDF document text
    • http://wewuped.iblogger.org/75615711535.pdfIn PDF document text
    • http://gubinuwub.iblogger.org/sample_persuasive_speech_outline_apa_format.pdfIn PDF document text
    • http://opensoda.pro/2006_mercruiser_4.3_owners_manualnbk1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_606050d1e22cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_6054707a2a6e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474987/normal_5fcb1756a4667.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/06d16304-4306-47c5-8a16-21db0e5f2ae4/xoluxojigulopoxavevuju.pdfIn PDF document text
    • http://lolodagizena.rf.gd/46094052440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef12598-dcf5-434f-97be-55dbce3ed6a5/simplicity_regent_44_mulching_kit.pdfIn PDF document text
    • http://bowetuxamu.rf.gd/remington_700_sps_tactical_magazine_extender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0f909c-aa59-4524-8a76-120145d13d12/bolens_bl110_owners_manual.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_off0000d565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD565 5024 bytes
SHA-256: 3fa0849985bbe89ed4aafd92e1b80f94e58b80c834df5bc03b08187f9b15255c
font_01_sfnt_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 11008 bytes
SHA-256: 55e2f9e95f636e774211982909cb5b4c928920dcdcb8661d193f3599511175e6

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