Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a7e932c2a7344d…

MALICIOUS

PDF

78.5 KB Created: 2021-05-06 19:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce57e4d54a96cdf92ad680363ef57dec SHA-1: 1a1c1a43312ca6f23373d45f27acff13b28e6760 SHA-256: 92a7e932c2a7344d2e5077c21dc1466a49f245e9f805078761156bab2615acb3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'resalured.ru/strik' and a query related to pressure washers, suggesting a phishing or scam lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=why+will+my+pressure+washer+not+build+pressure
    • http://suzamakulamuj.mypressonline.com/budapest_lonely_planet_city_guide.pdf
    • http://lorubuxetorifa.medianewsonline.com/acupressure_points_free_download.pdf
    • http://fufirewavit.getenjoyment.net/81462368541.pdf
    • http://mosomupusafebin.medianewsonline.com/23343099425.pdf
    • http://libutulidux.medianewsonline.com/waddington_spelling_test.pdf
    • http://jekefidaz.mygamesonline.org/kalefidewuxozibor.pdf
    • http://lijonotogi.scienceontheweb.net/search_strategy.pdf
    • http://warokibujiz.getenjoyment.net/secretarial_abilities_books_in_english.pdf
    • http://gutagige.sportsontheweb.net/baby_grand_piano_yamaha_white.pdf
    • http://dabinepoj.mygamesonline.org/1199940862.pdf
    • http://demuxum.getenjoyment.net/revised_bloom_s_taxonomy.pdf
    • http://nesarose.sportsontheweb.net/xevifakaget.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tajimipojimo/toxonedodifit.pdf
    • http://romapubimowa.onlinewebshop.net/blunt_abdominal_trauma_guidelines.pdf
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_6c59811cc58c4db6b63687816f3ad413.pdf?index=true
    • https://s3.amazonaws.com/lukepepe/bavodomuri.pdf
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_be544c5e2d3a4b86b3a9988fa96927f9.pdf?index=true
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_892197717df74b2fa565b29502d07a4c.pdf?index=true
    • http://zugepoguj.onlinewebshop.net/supufazusibitob.pdf
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_67d0f62e4fa8458bbee2d27271052e24.pdf?index=true
    • http://furipurisebete.onlinewebshop.net/cevdet_bey_ve_oullar_roman.pdf
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_652110a4f77243fa99fd7160edc6960b.pdf?index=true
    • http://bajekixizosi.myartsonline.com/what_are_the_7_habits_of_highly_effective_teens.pdf
    • http://xedemigu.atwebpages.com/9194364213.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3aa.bin
ccccc4bb698519acbb0a041241b3ec4513553770f3040b0b5f7b16a60be35856
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 5544 bytes
font_01_sfnt_off0001066b.bin
2b56d3aaa3f941719462e1bee288876b0e6828d45cfa3c88044566dfdbde8810
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 11224 bytes