Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc2b46c4845876e…

MALICIOUS

PDF

87.4 KB Created: 2021-04-30 08:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d8ffbc0ddca33d64a1a7f9486bb9b105 SHA-1: 2eda1999274aa8a589ed0a07950e3b0927a03d9c SHA-256: 4cc2b46c4845876e38b2bb72886cad882b25bfd9be2b83a62b2b45c83620608e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'resalured.ru' with a 'utm_term' parameter suggests a phishing or content-luring tactic. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

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=sara+gottfried+hormone+reset+diet+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486061/normal_6045fc79dd2f6.pdfIn PDF document text
    • http://morpeoplelife.ru/beautifulsoup_python_3._6_windowsklftq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405419/normal_5fc7c32ee5a92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485176/normal_5ff340cb95714.pdfIn PDF document text
    • http://spindlndou.space/masha_e_urso_portugues_portugalkl4ys.pdfIn PDF document text
    • http://phtech.site/chemistry_naming_compounds_worksheet0s8tz.pdfIn PDF document text
    • http://trelon.fun/gomipaxizuxelavmhc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383300/normal_602443eb31516.pdfIn PDF document text
    • http://fefevulo.22web.org/calendar_2020_september.pdfIn PDF document text
    • http://123dutch.com/77457230379r3kgw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/natewared/80314466090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084dc35e-ee2c-478c-8c5e-abc5a6538be6/how_to_program_brighthouse_remote_to_control_volume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30ec17ef-610d-4268-aacc-7ccce9c9f48c/is_the_green_mile_loosely_based_on_a_true_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b552c8d-250f-479c-9fb2-f26b2d99c94f/vubakutifet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d335967a-7025-4bdb-a563-d1a26254494c/how_to_connect_hp_officejet_pro_8610_to_wifi.pdfIn PDF document text
    • http://fukasutatota.rf.gd/apple_developer_enterprise_program_guidelines.pdfIn PDF document text
    • http://dilipomijovum.epizy.com/expendables_4_tamil_dubbed_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/86841899528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13e28e4-c3ba-40e5-926b-c2a48d14a4c6/who_guidelines_for_baby_food.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/norton_antivirus_portable_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/buranegudotutarexudixez.pdfIn PDF document text
    • http://mamotupot.rf.gd/pokemon_fire_red_mega_stone_cheat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba414cb-5c9a-42a0-ac21-8773fed059a6/24269418161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e4f80f-4716-4271-883b-302518e27224/asus_rt_ac68u_firmware_restoration.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_off0001158a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158A 5544 bytes
SHA-256: d8952084a1883cccf52a0e851eaeead433e8c000aab2d414c7f510c914344a6d
font_01_sfnt_off0001284a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284A 11100 bytes
SHA-256: 2bfd2d8f29d251e3167b3732d58dc4e78da9af132437de70907c7406ae17a3bc