Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f869438eee23c40…

MALICIOUS

PDF

79.5 KB Created: 2021-03-09 12:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 17068c6d46344e8290d690276f8fcee6 SHA-1: 2d6a2c3d2f4af14424782027f718b879c0048540 SHA-256: 8f869438eee23c40bf233eb99f0b0d442389ab469c2cd47c9dfd4c547f530dc6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/123?utm_term=smash+bros+ultimate+ganondorf+guide PDF link annotation
    • https://betogazubi.weebly.com/uploads/1/3/4/7/134768910/bilegemekurogikuwoj.pdfIn PDF document text
    • http://esportzmlevent.com/album_cover_finder_app_androidq4vke.pdfIn PDF document text
    • https://nikonewakudofu.weebly.com/uploads/1/3/2/3/132303001/7491129.pdfIn PDF document text
    • http://stylecurtains.com/migitedizobarelituknyg4k.pdfIn PDF document text
    • http://ver-alex.website/medialink_router_set_password612o2.pdfIn PDF document text
    • https://powilamalowigos.weebly.com/uploads/1/3/4/1/134131405/luzegudewijupem_mexevejatul.pdfIn PDF document text
    • https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/f34f21.pdfIn PDF document text
    • https://zawoluzowusemad.weebly.com/uploads/1/3/4/6/134697528/tulelej-dosizej-nuketajobuzeza-fonat.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/daily_news_paperzc1ca.pdfIn PDF document text
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/50683658534.pdfIn PDF document text
    • http://trokot-tonirovka.online/762389215772u548.pdfIn PDF document text
    • http://marafonsport.site/tcnicas_de_redaccin_de_informacin_ortografa_y_sintaxisarr74.pdfIn PDF document text
    • http://lnstagramverifycentre.com/befedebetegepanefof2yodr.pdfIn PDF document text
    • http://org-fruit.space/22954612556h9eaa.pdfIn PDF document text
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/fc3b82542b.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/jawusawar/authority_matrix_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b052f56c-a86a-4632-a885-33c6c53ed685/financial_accounting_for_mbas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9116cd9c-d477-49eb-8449-6fd72a2d1e9c/lokedijunad.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/vusatolilikelolava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0512c0-2eaa-4ebd-932f-ccc8dafde20f/what_is_the_default_ip_address_for_netgear_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/96189620917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e959de-e2a8-466d-b259-fc6bb5fadba7/surfboard_sbg6782-ac_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/biblical_hebrew_word_frequency_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b38b82-5bff-426b-a9bd-f0729ae23b6b/how_to_find_the_volume_of_a_graduated_cylinder.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_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 5564 bytes
SHA-256: 8275d90eef30bf3e94d784d96f779e021c5fa71c98cb0541517ac3d5782c54b9
font_01_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 10760 bytes
SHA-256: ca8ce99438a2e3d102beffbe2105af1869db2fc71a7dfa8e6c98cd7a5e8e32f4