Malicious PDF — malware analysis report

Static analysis result for SHA-256 40093f1c37a00b3e…

MALICIOUS

PDF

73.1 KB Created: 2021-05-03 06:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d71e14618db106f65d5dd9ab684975a2 SHA-1: 9f21a9a7f7acccc8c0de42ff232a6f5b30e86edb SHA-256: 40093f1c37a00b3edc7bc9e347a4be84b85e1e35abef9ea9c381cbd82eab236e
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 hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

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://baarspo.ru/strik?utm_term=char+broil+4+burner+bbq+cover PDF link annotation
    • https://cdn.sqhk.co/mibajufaneja/iigdhfS/japozazojitekivunutuwiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/jbgjLUs/feudal_system_meaning_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/ls0jjde/85582396018.pdfIn PDF document text
    • https://tagipuzato.weebly.com/uploads/1/3/0/7/130776724/88bd1cfd987b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460477/normal_5fcd188daca67.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/Bxugjdq/bixurabilazerovotedoseva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_60592932aef23.pdfIn PDF document text
    • https://kazamudadi.weebly.com/uploads/1/3/0/7/130775411/soxetudetewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483071/normal_606cde94e2bda.pdfIn PDF document text
    • https://mokenexub.weebly.com/uploads/1/3/4/4/134478104/5755766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482645/normal_5ff78179d9526.pdfIn PDF document text
    • http://trokot-roznica.xyz/baby_shark_1_hour_songs27w8e.pdfIn PDF document text
    • http://sun-italy.space/3731099818603k4t.pdfIn PDF document text
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/pubekuzetufivopovit.pdfIn PDF document text
    • https://midunufi.weebly.com/uploads/1/3/4/3/134387712/karegikotugof-rojif-kodetil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97777f9-1a5b-4ed4-9dbd-a283aed429ff/how_much_is_maternity_clothing_allowance_navy.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_5d9d0636321b49a0807d88603f6f3834.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a2bfd5-7794-462e-9f31-198232ab7662/shimano_alfine_internal_gear_hub_8-speed.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_9e1a86674cd345e298350b4810b2f2b7.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_c3a40f4abef6445fba680d9311ecc2c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2f1010-27bf-4033-b6dd-5fc3f3f61a8d/8996906828.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_b391c4e563814ba1aedab9966352222f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc5cb07f-3a71-4f19-8c29-36a1a5b18036/core_java_interview_questions_and_answers_for_3_years_experience_download.pdfIn PDF document text
    • https://b23ebcb4-2e41-4c68-a408-584c84124782.filesusr.com/ugd/5a2446_ed6c75c7cf1841598d5993f5f2de7b65.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_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 5028 bytes
SHA-256: 73e272994eedc08aade791c5618279d233fc5fc3af85a6d0d98dd63808163909
font_01_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 10948 bytes
SHA-256: e616466567c2404d3d447c365f1bdbf06c03eca7d432858154656d5ffe8938af