Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d2b524eb7e2b22…

MALICIOUS

PDF

163.7 KB Created: 2021-04-20 00:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f31692f0fc7e2e7587fa69f96ce0cd68 SHA-1: dda67d0a590fc412f7019dbdae861cfb2cf493f6 SHA-256: d8d2b524eb7e2b2250b12d290767104b2acc3f0f7a1399be566dd2531a7115b7
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=how+much+was+rent+in+california+in+1980 PDF link annotation
    • https://cdn.sqhk.co/dowufagit/PmAhi9f/18748672015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375350/normal_5fdd70cf25ce3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387718/normal_5ff55cd168d19.pdfIn PDF document text
    • https://cdn.sqhk.co/jobasalem/hjhaeib/stadia_controller_phone_mount.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/bCCvjbB/trance_music_radio_live.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/hAhbjfF/fatiluvanukawim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_5fd3cc3964670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_6026b2bbc5e70.pdfIn PDF document text
    • https://cdn.sqhk.co/besuduxikuvo/71DggOZ/street_fighter_4_ultra_combo_double.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/44ba695a-4cf3-4b70-b52f-c94640238d39/migob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f78aab9-f4b4-456d-9698-f10172e0ff93/how_to_reset_my_maytag_commercial_washer.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_9690f6a1674440fda7ad0b4c8a9b182e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abe5a72-f183-4696-b0dd-f5d589357965/the_little_prince_page_number.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_86df3afa43414f91ac9e4894ceea9082.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5921e69c-638f-4d27-b0a3-f6fe9ea9a748/who_are_the_ministers_of_jamaica_2020.pdfIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_7380f156a3f8403fa91d4f5d6d5d5116.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/39440927973.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/perranporth_eyeball_surf_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ec7c95-20b1-446e-9fb4-6a261753eedc/2005_mercury_9.9_hp_4_stroke.pdfIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_4f627064d12a4c87959e35c3f16df713.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/uworld_step_3_qbank_offline.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E1F 5716 bytes
SHA-256: 052152f8ea8e2b6c64b78462bcdcd07deabf61ae38c3f80858d610497664b0ce
font_01_sfnt_off0002417a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2417A 11968 bytes
SHA-256: ff75afdbc1383266d7ef31cc1dd891254f20291628011c0b66401c5cbb12f176
font_02_sfnt_off00026a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26A62 16248 bytes
SHA-256: 048a65dc3a83cb4eb1f7e67c8c7f5ba23e8d3c5984e920b6bd9bc0fc2dd35009