Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dada65620a20ea…

MALICIOUS

PDF

88.7 KB Created: 2021-02-15 23:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d160b8c1375d348cff528f34fac2d646 SHA-1: dc8bda2e99251803dac11cc2daa4c7b621a7f991 SHA-256: 87dada65620a20ea5d57d32b6218b3cbfa55abed04c617a5c21ddc47decf4a95
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The primary URL, 'https://jottigo.ru/123?utm_term=how+far+can+a+cessna+210+fly', suggests a phishing or scam attempt by mimicking a search result. ClamAV and ML classifiers strongly indicate malicious content, likely a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/123?utm_term=how+far+can+a+cessna+210+fly PDF link annotation
    • http://artdebug.site/witeromotokatodizitawadub8cr6e.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/VRjjgfp/begidiradakirurowatago.pdfIn PDF document text
    • https://cdn.sqhk.co/gumakulex/ehi6iie/ncg_trillium_theater_grand_blanc_mi.pdfIn PDF document text
    • http://malapiwo.66ghz.com/loaf_tin_size_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_602488f603d4b.pdfIn PDF document text
    • http://replyua.site/460508341191pze5.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/ryhdHja/nail_designs_2020_short_square.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_5fe97698e218b.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/aiihgY6/lisevojitametoritiwuva.pdfIn PDF document text
    • http://strahauto.website/blaupunkt_radio_codes_freekyi1f.pdfIn PDF document text
    • http://bred-enligne.com/segekebopokowsl31.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/6ckciaN/xanizefitapapijela.pdfIn PDF document text
    • http://idealica-co.site/android_police_free_appskrsfg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guganevefaluson.rf.gd/39922465045.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/25380517966.pdfIn PDF document text
    • http://novosumagib.epizy.com/apostila_administrao_de_empresas.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/26607402772.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/gmail_app_in_jio_phone.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_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 2968 bytes
SHA-256: 1c91280eb79ffdc858b6ecd2b9b1b9121e398c569f5702dd47e27479ee3b0056
font_01_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 5356 bytes
SHA-256: d8e74edf456df9d70703923afeac5f6006ab470774cd948982a117602ebae6c7
font_02_sfnt_off00012d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0D 12020 bytes
SHA-256: 78f4b46c7541ce0fd3a9a4eb09192de854a0986d9c83e10505c57379b2cb6c33

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