Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8b5c149d12b70a…

MALICIOUS

PDF

79.6 KB Created: 2021-03-31 04:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c516be8040c6337630567653a2970c24 SHA-1: 58ddf076b51a167c567211dcb938851141216962 SHA-256: 8c8b5c149d12b70a5e231920618f80518f52ef9da2ac63bf654252090d5fe38a
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 0.9995

Heuristics 5

  • 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 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=pickleball+tournaments+rochester+ny PDF link annotation
    • https://cdn.sqhk.co/relulapezele/amgcif1/labyrinth_dictionary_definition.pdfIn PDF document text
    • http://wekeb.space/what_is_a_black_sand_dollar3e16w.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/ggVKu2E/zamovanewegulajoxaxibuw.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/ghhkhbD/wakixoribuwogi.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/L3jasjh/22284908929.pdfIn PDF document text
    • http://afracheat3.xyz/frecuencia_cardiaca_tecnica9rdnu.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/cgjZuYi/cold_war_black_ops_gameplay.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/07d09703-8c27-47f1-a13a-48128dc45815/how_to_lose_weight_fast_with_indian_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1913b25-d4a7-4e1f-9f50-85160bc2e539/ryobi_2700_psi_pressure_washer_not_starting.pdfIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_2d0ab066ec214bfeabedfdcaf91cb9e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/how_to_turn_on_jam_hang_speaker.pdfIn PDF document text
    • http://xatonidolib.epizy.com/yamaha_mg32_14fx_effects.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_63dec92b59da42ad99cc105804aff076.pdf?index=trueIn PDF document text
    • http://kisolapuri.rf.gd/tratamiento_de_anemia_ferropenica_en_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/zofarajiwiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2407ddae-17f2-4b2e-b830-01a3b96fe3b4/dell_poweredge_r510_drivers.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_7679029359ad407298b0bd99d6d74df7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mufukep/19291423491.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/53043640414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2188cce0-eff6-4d0b-ad12-c9e6bcd30e7b/72605242674.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/exercice_barycentre_corrig.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_e7b468257d074f02b5e79bc1753d3cbb.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
    • 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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 5348 bytes
SHA-256: 4135a218725dd2c778a933dae135fb6f61b822cea321d8ecdbde6200152c2445
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 11396 bytes
SHA-256: c987738e6750e8ac8ce949c7c4388d93e4fb05e4bfcbf94b84a493abe3d5eb17
font_02_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 16076 bytes
SHA-256: c75124cf82eb85a290f44dee9d31b74c8eae8229c650450d727e37a6e1035227