Malicious PDF — malware analysis report

Static analysis result for SHA-256 be406a87910298c1…

MALICIOUS

PDF

75.3 KB Created: 2021-03-05 09:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0af464fe90e8849f99df74c610459ef1 SHA-1: bc7ad87ef3271730e0d052091507a1aed0ce4f08 SHA-256: be406a87910298c1bb5922f7c6d633a7b2717af86c8c2489a41ce57718c1e4b0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a URL with a 'utm_term' parameter related to a common search query indicates a lure to attract unsuspecting users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/strik?utm_term=why+is+my+tower+fan+not+blowing+air PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418584/normal_60011ed61856c.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/HSMTmja/ledafubamaruwosufapefaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/h4P2ojg/steampunk_movies_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xotakuzazuf/cmwskgf/light_slinger_heroes_puzzle_rpg_mod.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/xapuzepawofupowitap.pdfIn PDF document text
    • https://cdn.sqhk.co/dowivita/nmNghBu/johnny_bonasera_1_mod_apk.pdfIn PDF document text
    • http://tublitalia.fun/disney_princess_coloring_sheets_free_printablexky4f.pdfIn PDF document text
    • https://mazofowi.weebly.com/uploads/1/3/4/3/134312703/mikobel-dawobuvulefi-wawipufupukirar.pdfIn PDF document text
    • http://esagafow.fun/garmin_approach_s60_reviews7vwkh.pdfIn PDF document text
    • https://cdn.sqhk.co/jujifefa/RTPifpf/racing_gps_lap_timer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476941/normal_6038cf44d4aaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_60295529a4b55.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/cf85dc49-9b77-4399-9ee3-49b078b1261d/breakfast_at_tiffanys_full_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/155d58db-91bf-4fb8-a669-1d669ee17775/931541855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b7b6d5-68cc-48b4-a839-2c84a8cd59dd/duke_3_out_2_in_motion_offense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3b167e-617a-4e85-84d0-6ab98c0298dc/lelajewugufopizigubek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d19ab7d-3334-40dd-8736-8eafb8adfae2/57154163628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f9053f-a202-4a29-810e-6d24de44122d/algebra_2_and_trigonometry_textbook_houghton_mifflin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075c03d4-5eb2-49da-b7b2-5f8591e53cbc/garmin_nuvi_2595_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941977de-4fea-4f43-b023-eb0e7cebe551/3890703848.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_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 5528 bytes
SHA-256: 009ec076b05f18efd07bd96afd3865a56a3f299007a1c1c82fcf702867d6be12
font_01_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 10732 bytes
SHA-256: 6a08862fcd57addcab0289d5ff6d5122181eb76170432a206a489cc3c57a146e