Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fcc7f89cfcedc5…

MALICIOUS

PDF

77.5 KB Created: 2021-02-24 03:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 11c6b3368e831d26dfdf21af79e79e92 SHA-1: 9cdb644f7a1592071a480f4a3beab40a22c8677c SHA-256: 87fcc7f89cfcedc5b2513676f86538292bc8063706b521154b8ea9e4046e8147
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to redirect users, likely to a malicious site. The presence of external URIs and the overall structure point towards an attempt to trick users into visiting a compromised or malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=andover+mills+bed+frame PDF link annotation
    • http://faxejurimuzuret.22web.org/nupebesipanevugel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_60351ee0bc8be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_600a4dc189d5e.pdfIn PDF document text
    • http://martakkord.ru/33149765013xldwe.pdfIn PDF document text
    • http://italystore.pro/914102583788bpeh.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/cJgdr23/rutofasis.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/zhe7nWv/marktplaats_apple_tv_2.pdfIn PDF document text
    • http://itnegozio.info/65330710072rtxsg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370265/normal_5ff585c626765.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxukulalodi/ngfiiih/nagubonabub.pdfIn PDF document text
    • http://kubumumonal.22web.org/introduction_to_teaching_becoming_a_professional_5th_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489713/normal_5fec25e41b922.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460463/normal_5ffdf5d9e00a8.pdfIn PDF document text
    • http://betflixguvenilirmi.com/tiwuvuselagegunihs532.pdfIn PDF document text
    • http://istlan.space/panaburixan9yvc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rumavajusugeg.rf.gd/mipa_cc9_data_sheet.pdfIn PDF document text
    • http://zasegusof.epizy.com/75624724552.pdfIn PDF document text
    • http://zenomidesedi.rf.gd/how_to_stay_sexually_active_after_50.pdfIn PDF document text
    • http://febarufowit.epizy.com/81554491983.pdfIn PDF document text
    • http://xuwolerapole.epizy.com/parallelogram_law_of_vector_addition_examples.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 4952 bytes
SHA-256: 662fa25515dd4ad7310d580717cb4d1afe6f032a85268a695dec3dcf6be5a097
font_01_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 10836 bytes
SHA-256: 1dadc160eb3d2583bcf013bf2e750080c717cfe3a82d7e59f79ffde4fa3854da
font_02_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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