Malicious PDF — malware analysis report

Static analysis result for SHA-256 915894a53cfa7d1f…

MALICIOUS

PDF

80.7 KB Created: 2021-04-07 02:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1e45be4bb9967674ec2718a3c7ad9df3 SHA-1: cf07df57b179182f0ec6a021596761f7ea80377f SHA-256: 915894a53cfa7d1fe4424a0ffa77b39e5861de5924bcdc30ca113455dac69098
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=roux+method+j+perm PDF link annotation
    • http://xomaweluk.22web.org/63939873726.pdfIn PDF document text
    • http://conicppjry.bid/temulezakamadaz9i7c6.pdfIn PDF document text
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/8fd74c4e9f353.pdfIn PDF document text
    • http://trysoda.club/center_point_scope_6-20x50szrqx.pdfIn PDF document text
    • https://lafivejazep.weebly.com/uploads/1/3/4/7/134771341/sesawawomex_fizifigefitu_zinetexetusode_dimaxumizox.pdfIn PDF document text
    • http://zofapojofiwifi.iblogger.org/independent_audit_report_sample.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wabupotobexuxu.epizy.com/ieee_power_electronics_projects_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c9ded3-e1a7-4df3-8d5f-840ca3bcf59f/25445414859.pdfIn PDF document text
    • http://mebebopolimo.rf.gd/53720194535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa09d9d-a9be-438a-afd7-afecd7f9839c/how_long_does_the_dyson_v10_battery_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1fd62f-4837-4186-ba42-b67bcd1ed155/what_is_the_gvwr_of_a_international_4900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c220d306-7a2b-4b92-9543-d95efe9acc22/meaning_of_dbt_in_cibil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e3b784f-c890-4c0e-922c-f0a51fe3ee32/nikon_af-s_dx_18-140mm_vr_camera_lens.pdfIn PDF document text
    • http://xubaforan.epizy.com/access_archived_gmail_android.pdfIn PDF document text
    • http://robipurovunox.rf.gd/mumodoposolidosezirujan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8821c33c-5d88-4f8b-8351-b5fd8afb7444/safety_not_guaranteed_movie_ending.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_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 3276 bytes
SHA-256: 02365d6d15960047a9694e7f2537c0ec85e756fae82b5f66f3534a2d753d5e94
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 4928 bytes
SHA-256: 0780464dfc57ec4ceae93fa46d3e895f10af99031e689a142919e1f98f67dbd0
font_02_sfnt_off00010fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 11048 bytes
SHA-256: bed2d5c42d8780348e9cd607622ce44b7c9cedf77c99ff0f835da7b166b0dbae

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