Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e9592b08aa9514…

MALICIOUS

PDF

75.3 KB Created: 2021-02-17 20:35:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 328f878d058b49532c9e5d53e1a56931 SHA-1: 39b8caee17d1e21d16da78455e0938737848cbf8 SHA-256: 28e9592b08aa9514e11ec89f8dc8fdbc6497a39b8c1303d4e0f5c11d465a7212
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one pointing to a suspicious domain (jottigo.ru) with a UTM term suggesting a lure. The 'SE_URGENCY_LURE' heuristic indicates the document uses language to create a false sense of urgency. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=example+of+covid+safety+plan+ontario PDF link annotation
    • http://losinglotterynumbers.com/rarovunoizf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_5fe98abc31fbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fc97a57076d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_60175ee7a2635.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473903/normal_5ff665b6509e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489583/normal_5ff54a3e28136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476268/normal_5fdc17ad8364c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_601d82fe0c9c9.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/pavotonefokaxikowjv89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481831/normal_5fe271bdc0d6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tamegebodow.epizy.com/what_is_a_sony_wega_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/age_calculator_application.pdfIn PDF document text
    • http://maferodo.epizy.com/is_hp_photosmart_8150_wireless.pdfIn PDF document text
    • http://romezegipoxo.epizy.com/alpine_village_swap_meet_vendor_information.pdfIn PDF document text
    • http://borobosen.rf.gd/boating_license_florida_study_guide.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_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 5488 bytes
SHA-256: c551b0fc997170e37e84dde4cbac12d0f1e2eccd37eeaad5ceac1791f9141327
font_01_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 10176 bytes
SHA-256: 446a93c16628fbe89abb9bebb850e51127ae4b06fb0f6850c840d812ff06847a

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