Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b0b40cecf7349e…

MALICIOUS

PDF

81.4 KB Created: 2021-04-20 23:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3b99696e59d22dd394fc1651441651ed SHA-1: b2f58f78c6c98df883cdd7881162c23a3e5c3728 SHA-256: b2b0b40cecf7349e836166cf1dd99bfd0c64b87801e58c5d34fe27651edd8380
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, many of which are hosted on disposable or dynamic DNS services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=how+many+calories+in+burger+king+junior+whopper PDF link annotation
    • https://geguxawuxereko.weebly.com/uploads/1/3/1/3/131379712/a4e046f5ccaaa9.pdfIn PDF document text
    • http://kind-insta.site/are_bowflex_dumbbells_worth_itgsnqk.pdfIn PDF document text
    • http://kirisixifikixon.22web.org/kaximiwarawarise.pdfIn PDF document text
    • http://goodxday.xyz/descargar_santa_biblia_reina_valera_1960_gratis_para_celularsph0h.pdfIn PDF document text
    • https://wowujagudafu.weebly.com/uploads/1/3/4/7/134751604/7166608.pdfIn PDF document text
    • http://merishwheelrecords.com/253885851561wnn4.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/pimusugonodeguli.pdfIn PDF document text
    • http://fojefojegut.medianewsonline.com/androcentrismo_definicion.pdfIn PDF document text
    • http://xifasiv.getenjoyment.net/88103358664.pdfIn PDF document text
    • https://zetosodorab.weebly.com/uploads/1/3/2/7/132712291/66bb9b5814b.pdfIn PDF document text
    • https://rufilepevaga.weebly.com/uploads/1/3/4/4/134444742/3318368.pdfIn PDF document text
    • http://greatmasters.biz/alaska_learners_permit_practice_testscvfr.pdfIn PDF document text
    • http://mandarin-fruit.space/scales_fx_-_deductive-logical_reasoning_examples81um5.pdfIn PDF document text
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/7811104.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fepirag.epizy.com/avs_audio_converter_free_full_version.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_42f70c30272249bb9d5aa6bfb59c7aa6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac382532-50a8-43fa-ba07-7d73d1b2ff09/40396552758.pdfIn PDF document text
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_eb5000210d3542ae98c8e98fd92d806d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93b3a9e-f695-4bb5-8044-6f3cfd340a91/viledibidavisiwolo.pdfIn PDF document text
    • http://bafuwujix.atwebpages.com/catching_fire_full_movie_online_free_123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd1a6591-6f5a-48fc-abe7-613ff824a412/vumafofi.pdfIn PDF document text
    • http://judewal.rf.gd/xuxet.pdfIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_7c1762d026274087847fba9dc794a719.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_ff2d561730524e27a17a29d5b1172a7d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 5584 bytes
SHA-256: d208e49ba0b09d8dee45e63f4ccbaa60a3569161817a8c855a1893222af6658c
font_01_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 11408 bytes
SHA-256: 0ddcbeee476b0aa045ed4715b88de2a0d5f4ea8e43fa9177195f7cbee950fae1
font_02_sfnt_off0001276d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c