Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3f5ad78288d31b…

MALICIOUS

PDF

77.9 KB Created: 2021-04-11 14:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d8678253fbf6301312f0656d14b94dbb SHA-1: eb405c47341d58db9786a7e2d0d468f0e6070de9 SHA-256: 2a3f5ad78288d31b94d443f1c289e35e345b89c30ffc23101a7e61fc079f8d91
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://gimoguvi.ru/strik?utm_term=timex+watches+prices+in+pakistan', is presented as a search result, likely to trick users into clicking. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gimoguvi.ru/strik?utm_term=timex+watches+prices+in+pakistan PDF link annotation
    • http://zedukibawubige.22web.org/how_to_repair_water_timer.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/bevutemupa.pdfIn PDF document text
    • http://bluebadgeform.com/614475487482xzn0.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/battletech_wiki_marauder.pdfIn PDF document text
    • http://fapseo.ru/sinopsis_de_100_aos_de_soledad_de_gabriel_garcia_marquezo5ixe.pdfIn PDF document text
    • http://videohost.space/95296990134fcou1.pdfIn PDF document text
    • http://xokesate.22web.org/customer_service_job_summary_sample_resume.pdfIn PDF document text
    • http://teenagetutor.online/the_greatest_my_own_storyxqqcv.pdfIn PDF document text
    • http://goproits.com/serial_de_instalacion_windows_8.1_32_bitst2sro.pdfIn PDF document text
    • http://tawefokare.22web.org/rikiwosozimipojobuf.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
    • https://uploads.strikinglycdn.com/files/5f0a8094-740d-4545-8b12-1a3fa45cc31d/topugolunena.pdfIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_2de8d35b0eb04d47abb4b3fbe2dd4842.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45af7843-ae5c-4e9a-aeb8-b27977ea2c74/annie_script_free.pdfIn PDF document text
    • https://b56e6f12-3f4b-4b75-bc29-9585eb3fba71.filesusr.com/ugd/73f0dd_90ff594347884dd98c49cd17216a3f75.pdf?index=trueIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_edd386823a0643529647489ae23cecf5.pdf?index=trueIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_cfce18f1cb2d4581bfdd5b5c0e5198ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84314f44-28d1-4224-bace-c2815680e850/ff6_missable_monsters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e93a5f0-d3f6-4eba-9dd5-5f2e30e006c9/what_are_the_different_types_of_drawing_tablets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ed986a-8517-4e24-ae52-2ea1365ead5e/what_is_the_best_cd_player_boombox.pdfIn PDF document text
    • http://lojokedasu.rf.gd/85778071991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9850b5bc-75bb-458d-aaa1-27f3e24a675c/29917162069.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_50b3e0a2fbfb4199804c8251a7a7620d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/337c667f-7412-4879-a177-71b695244757/ponexojujafovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a96e10-554d-4bc2-bd7a-b7eef0a9a9e6/lejix.pdfIn PDF document text
    • http://xafonabikox.rf.gd/haad_dataflow_verification_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45735d4-898f-48e7-8466-8b9067098429/nefojafo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 4992 bytes
SHA-256: 15e9a4ca1ac13e09658700c6c2aac62eff4b7af11cc0e0be2f4020b60173cde6
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 11124 bytes
SHA-256: 97f5fe89d01e92bded864c73cb71734d9526edea6cbbf4092818adbd7ef54d14
font_02_sfnt_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c