Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b2e16d21ce64b5…

MALICIOUS

PDF

75.4 KB Created: 2021-05-14 00:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4fdb0baeac0d9f8c2cb6f9edb12c0a4d SHA-1: 24dd990941e082318bfee0c28ea574308771221f SHA-256: 27b2e16d21ce64b514c39a83d0e4be405ec480737bfd27d2af48ac870601c4e4
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary suspicious URL being https://resalured.ru/strik. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed as a link farm on disposable hosting, further supporting a phishing or malware distribution attack pattern. No scripts were extracted, but the presence of multiple external URIs points to an attempt to redirect users to malicious content.

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://resalured.ru/strik?utm_term=master+forge+model+l3218-1 PDF link annotation
    • https://cdn.sqhk.co/libavesonon/iejiiay/search_and_explore.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410459/normal_5ffb8acf2f95e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_6016ac92a0435.pdfIn PDF document text
    • https://kamojadatuxam.weebly.com/uploads/1/3/5/3/135316538/lujanitaguvemodineda.pdfIn PDF document text
    • https://cdn.sqhk.co/dufikibagi/dhbEih6/nukagopiwimidizexifalem.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/kupupifevosovufidamo.pdfIn PDF document text
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/c5c87e3539407dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_600adae73e8f9.pdfIn PDF document text
    • https://cdn.sqhk.co/jozazixefuf/bdeNgcQ/stopwatch_for_wear_os_android_wear.pdfIn PDF document text
    • https://safubijob.weebly.com/uploads/1/3/2/6/132682970/3e178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_603020ac13e61.pdfIn PDF document text
    • https://niwitibu.weebly.com/uploads/1/3/1/6/131636677/xaruti.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/ichiyrR/cheesecake_recipe_with_cream_cheese_and_condensed_milk.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/cAajgje/wisubinewij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380213/normal_5feb89b385e76.pdfIn PDF document text
    • https://tatazopizen.weebly.com/uploads/1/3/1/1/131163492/4197945.pdfIn PDF document text
    • https://ligonulijer.weebly.com/uploads/1/3/5/3/135318365/nawiwan.pdfIn PDF document text
    • https://roloruvibufezer.weebly.com/uploads/1/3/1/4/131410818/detal.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/fbdb538b-5298-4cc5-9fc8-f4a90e5bd204/59211254077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eeeab32-8177-409c-8c96-d38ea9724a9b/hamlet_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9423e280-77d8-4293-9294-53310d4f70f2/dewalt_drill_driver_combo_kits.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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 5804 bytes
SHA-256: fe696e2917516230fedbdfa1a460178459fa3550b4678dbf1059d5c28fd974cc
font_01_sfnt_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 11336 bytes
SHA-256: 3c1b75591f697c4f66e7719ef65c2292e02ebbea8006342053c12afd03e9fc50

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