Malicious PDF — malware analysis report

Static analysis result for SHA-256 db276c21ea2804ad…

MALICIOUS

PDF

77.6 KB Created: 2021-04-03 01:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b4fcae6b99d2251a16012b1c5657689b SHA-1: 5436963b298e88927ff38121af052f7b74ab866b SHA-256: db276c21ea2804ad60c05e0071971290fdc8ef46ff8e40bc8e7525da3dc67c16
186 Risk Score

Malware Insights

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

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 0.9991

Heuristics 6

  • 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 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://crophysi.ru/strik?utm_term=can+you+use+detergent+with+steam+mops PDF link annotation
    • https://padukasafif.weebly.com/uploads/1/3/4/4/134404544/9d8379e3.pdfIn PDF document text
    • https://noxesole.weebly.com/uploads/1/3/4/6/134615833/xurenuvorejodeton.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/mixakobo_sozeg_wised.pdfIn PDF document text
    • http://finonit.mypressonline.com/carlos_alberto_brilhante_ustra_rompendo_o_silncio.pdfIn PDF document text
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/6979860.pdfIn PDF document text
    • https://bawimadesudife.weebly.com/uploads/1/3/4/3/134363746/588675.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/administrao_financeira_ross.pdfIn PDF document text
    • http://wivadanege.iblogger.org/viper_4115v_remote_start_installation_guide.pdfIn PDF document text
    • http://najisemure.medianewsonline.com/dowezemuw.pdfIn PDF document text
    • https://cdn.sqhk.co/gorusuvu/GpjeZgo/fuxipugegogalatowaz.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/mappa_di_alicante.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/gjhZWS4/color_by_number_race_cars.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/2nw4pRt/86804340365.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/death_penalty_argumentative_essay_against.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/6c0cbc26-df8d-44ae-9f67-ec9613a8255b/boted.pdfIn PDF document text
    • http://dodigemadepa.epizy.com/bufejemukubobuzobamabubeb.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_07271bf22d854b15a0c2d581d78fc4eb.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_78ab567fd8cc44dbb69380309d9f17a5.pdf?index=trueIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_c7095509760c4887acc6aa6dfbcb6a86.pdf?index=trueIn PDF document text
    • http://rekekolulopar.rf.gd/pbh_2100_re_bosch_hammer.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_20f1442dde7b445cb1b4c07109c359be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7a7a1c5-56fe-471b-9173-14c4d7830000/how_to_treat_cystic_acne_at_home_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0304aa23-c1a3-449e-add0-34e8474e3a0a/how_to_reset_maytag_dishwasher_control_panel.pdfIn PDF document text
    • http://bewegaxijev.rf.gd/the_truth_about_forever.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_04dd59d0639542f5a57527731f93a989.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_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 5440 bytes
SHA-256: 28d21df2dd8c9d3f387999a3e18196ce4f6b981721b19afef98868e621eea27e
font_01_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 11812 bytes
SHA-256: ad828358b2812dbe8a2e71e76a59e23b296d7cae4ec102a8fa6b7ebe1326e498