Malicious PDF — malware analysis report

Static analysis result for SHA-256 4803ba4dbf453e03…

MALICIOUS

PDF

74.0 KB Created: 2021-03-16 11:16:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0b0b67d066e8615d868482f5d924d5f0 SHA-1: bc698d725cfdc3066086a4b9a45b253ed3f8ba6c SHA-256: 4803ba4dbf453e031be0d580c65d033eb5def6ecb153c19b7488241a14a5d7f1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 phishing or trojan threat. It contains numerous external URIs, with a primary suspicious URL pointing to a domain that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to an installation guide, likely to trick users into clicking the malicious link.

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://soxebez.ru/123?utm_term=nest+thermostat+3rd+generation+installation+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417807/normal_5fe35cb7d7bfb.pdfIn PDF document text
    • http://redpandarecycling.com/bajos_instintos_pelicula_completa_sufow4x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413346/normal_6037f273a7ce8.pdfIn PDF document text
    • http://tosety.xyz/ip_subnet_calculatorshu05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_600caa3456b05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479688/normal_604d6572ce525.pdfIn PDF document text
    • http://shoop-fl.ru/does_verizon_have_jitterbugprpvd.pdfIn PDF document text
    • http://cabinetsop.xyz/the_simpsons_game_of_life_board_game_rulesdlhgq.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/07d0687d-9891-446f-925b-b7bebb679416/literary_theory_and_criticism_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524398eb-d779-45fc-8dbc-6c38e0d8c364/ingenuity_portable_swing_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3d386a-1915-4fd8-ba79-bd4615482c62/more_than_ever_before_meaning_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee2faa3-b7e4-4242-89b5-850a376cf64d/38772281952.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/46883692419.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/a_day_in_the_life_of_ivan_denisovich_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd52179-3267-4da9-b9ad-a7dacb7346e3/how_long_is_the_little_prince_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c4cb232-5dec-4948-a48f-c1eb2dd40845/tagiribumofularidoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3b8267-8d48-4903-8e2c-8b274ed73f33/72580831268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34795244-b274-4b8e-9401-7178fa1748ce/20019463594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d71fbe61-a5a9-4d1e-89c9-52647ff0278a/html_and_css_tutorial_for_beginners_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f929f845-ad19-4de3-85fd-06553fa70203/xagajegugomenavukefu.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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 5372 bytes
SHA-256: 72e34187242141e05cf0a787e77934ce9bb6f79e08ad32d6b86d69bf2eeda8c0
font_01_sfnt_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 10824 bytes
SHA-256: 90254bb55babb2a2fb6a67388b542917ebaf180bd7b5cd43c61315c02b9b0d90

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