Malicious PDF — malware analysis report

Static analysis result for SHA-256 484fad00eb6b3dac…

MALICIOUS

PDF

74.5 KB Created: 2021-04-01 20:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2e00888a16a77e1f2c36488fb6c557c3 SHA-1: 330f345947f9327ca9da8e3b0cc3d06e30b72b1b SHA-256: 484fad00eb6b3dac8c140fba1498b371c730fa8e82d131d895d7020796dbc2f8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. This is strongly indicative of a phishing or malware distribution attempt, where users are lured to malicious websites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/123?utm_term=formalist+criticism+format PDF link annotation
    • https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/kumumolefivof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_604e5fe2e8840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_60466b987a83d.pdfIn PDF document text
    • https://votivugaxowo.weebly.com/uploads/1/3/1/1/131163932/jubefekiralasam.pdfIn PDF document text
    • https://cdn.sqhk.co/kujufemom/DhbFjcl/583760578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427076/normal_5fc570868d6a9.pdfIn PDF document text
    • https://purelukanixavaj.weebly.com/uploads/1/3/1/4/131454065/mosajebufaf.pdfIn PDF document text
    • https://cdn.sqhk.co/zafilivopupu/ihiAjjP/andmesh_kamaleng_hanya_rindu_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407804/normal_5ff4ece7cae3a.pdfIn PDF document text
    • http://fikunigogijori.22web.org/animal_worksheet_islcollective.pdfIn PDF document text
    • https://nokemodikobo.weebly.com/uploads/1/3/4/3/134308311/sutigade-gafur.pdfIn PDF document text
    • http://mivofalo.22web.org/spc_format_in_excel_free.pdfIn PDF document text
    • http://welaxixijexawi.iblogger.org/gepituw.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/G1F31hd/mitiwisexekojagedepa.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/2470189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_600d8c4db2f0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_aea724e5f85a4916be20e2abcaf6b187.pdf?index=trueIn PDF document text
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_7b57d5e3f90145f08366d270b11a346b.pdf?index=trueIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_9b727c8f04b3428f9a6e80e7908a22ae.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_c7808982ee024057ba960ebe49e82b74.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_fe53b6d2fb5a431bb0ffe507bf9f7148.pdf?index=trueIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_279472cacce4443abf19c8a55b55c371.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_b2676ead934143789a458f25280492e7.pdf?index=trueIn PDF document text
    • http://tadoloko.epizy.com/2001_buick_lesabre_service_engine_soon_light_blinking.pdfIn PDF document text
    • https://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_3af8e94930024551b17b83d6c9809a27.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 4980 bytes
SHA-256: 56e53b585b0f7ef09430ddeb6bfd8a43c1ed37367d91c308dc94c4baaf8ff44b
font_01_sfnt_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 10060 bytes
SHA-256: 5cc95b641fadb21ee561c225acc1f410d223c248de0090c0747542174bf73a07