Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd31275986bba6ec…

MALICIOUS

PDF

89.9 KB Created: 2021-06-04 14:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2478d44984123d0e328115a996449112 SHA-1: dee7fe3bdcae4bbb647ac07aa7bcd156c360c076 SHA-256: fd31275986bba6ec3450f42a8ce893a0888bb56f1ec62a7e018cd7dad069faa5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wastran.ru/pbw?utm_term=ccnp+data+center+certification+guide PDF link annotation
    • https://lijowuvum.weebly.com/uploads/1/3/4/6/134624244/0fe92ec291ee1.pdfIn PDF document text
    • https://daguvosiliwu.weebly.com/uploads/1/3/1/4/131406153/fusogug_donitovem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_604ff280d801d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463308/normal_5ff87381730c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_601b52685cb05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527042/normal_60591836a3d56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_60468a18252f3.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/bagebe-nizilabuku-kiwulo-puvifidufed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://werinenimuta.pbworks.com/f/what_are_the_3_levels_of_the_ecological_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b535487e-25c4-4f24-a968-dfb9ae742f68/shakedown_hawaii_ps_vita_gameplay.pdfIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144591558/55802441274.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/144411249/80446880196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df8051a5-ee25-4966-915e-911b0961805b/how_many_christian_martyrs_in_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f72196-9ae1-451f-a9aa-e5b467e0e136/should_i_buy_a_keurig_or_a_regular_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88750328-ff3d-41d6-a264-7f74bf3d4b39/jarivum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a16a9c-0f91-4c66-ba3d-0f5f783ff6b9/my_talking_tom_friends_mod_apk_revdl.pdfIn PDF document text
    • http://memofemovo.pbworks.com/f/59410629341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a13941-f5d8-49b1-925c-d75f1b3f86e7/brother_dcp_t310_driver_installer_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c79b4d7-5837-469c-8264-6248c1714297/64015426703.pdfIn PDF document text
    • http://juvudibip.pbworks.com/f/99443948189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/028bd1f5-1dc0-4631-8149-716f893b535f/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e70f718-bb5a-47f1-a5a5-a2d6681a94fb/what_is_base_rate_fallacy_mean_in_psychology.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 5020 bytes
SHA-256: 0712b7ded23088ad3f5bf2fdde16e7db5e964411f57c813268882ac64d12647d
font_01_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 10972 bytes
SHA-256: aa573f1bc77068b864a15cd4ad5ec5bb47f1b83b867cdec9d5300efe06dd2c88
font_02_sfnt_off00013dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFE 17468 bytes
SHA-256: c4c55b886c27bf0318783ba6dcbe1dd87a098f4adbc3b603265148fce654dfcc