Malicious PDF — malware analysis report

Static analysis result for SHA-256 a962c7a54b48c54f…

MALICIOUS

PDF

95.3 KB Created: 2021-03-14 21:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ff06ea79604b45c5c8454aa57ad0d640 SHA-1: 550dc2f9a1df2e33a8507bb097d0f58fb39b4e86 SHA-256: a962c7a54b48c54f133b72afa0198df022ad5620c75caf4cfd6a7f9b05c53f51
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 0.9967

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://lozipotod.ru/wix?keyword=principles+of+marketing+16th+global+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/disidudi/hehjTVm/belebagadovelejatu.pdfIn PDF document text
    • https://zibaxewax.weebly.com/uploads/1/3/4/6/134699960/buwinefadegubewi.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/jagdosj/5188572491.pdfIn PDF document text
    • https://sajixigepanosu.weebly.com/uploads/1/3/1/0/131070231/gonabezumujet.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/963fcf1d12e3fbc.pdfIn PDF document text
    • http://5coupon.info/vaxinasapogetesemafopiliodlen.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/fTFDgeW/gelibadulalafilevodax.pdfIn PDF document text
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/suxirabijeterijupobo.pdfIn PDF document text
    • http://goods-amzon.com/makadiwuvulilusetimxmy6.pdfIn PDF document text
    • http://card2card.live/21845722506w1ba9.pdfIn PDF document text
    • http://vinnipoh.fun/fiwijutvcif.pdfIn PDF document text
    • http://amsidgi.xyz/security_alarm_mobile_anti_theft_app_for_android1luyz.pdfIn PDF document text
    • http://static-get.top/golesovetq1o2a.pdfIn PDF document text
    • https://fibimijisu.weebly.com/uploads/1/3/4/4/134461798/5119834.pdfIn PDF document text
    • http://6gusevshop.space/case_information_system_gujarat3fgvi.pdfIn PDF document text
    • https://cdn.sqhk.co/zifixanuk/jcjgYji/i_am_innocent_game_wiki.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/5c8225a3-1372-4714-8d12-4e78d1c95505/78597152097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea80a40-a329-41b1-aac1-43a1a21fe2df/what_games_are_included_in_atari_flashback.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e97c7a03-b99e-4057-9569-d3d09f4548b1/cant_get_filter_out_of_whirlpool_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c198e84-c7c8-4bbc-ace7-70209e74d473/can_a_sony_handycam_be_used_as_a_webcam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4cb71ee-3aab-40ca-9915-66c4e1a05023/does_usps_ship_internationally.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704f7cc4-14a3-461a-83ae-b642363009e4/temas_presentes_en_la_obra_la_casa_de_bernarda_alba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a1e237-fc31-479d-b98f-fe825c4c2da0/8992460766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90528f19-500b-44e3-b2df-12758b82803d/96656343971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2847c5d-f01d-419e-a012-6ea5d01a6b2e/buvosewojubakanilajabub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89cd3f0-6770-4a9d-ba01-822693124501/emerson_self_reliance_quotes_and_meanings.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 5980 bytes
SHA-256: b030514cacc18a3a78396994de466fe5c3a4f96726f36532675bab96bafb0ca3
font_01_sfnt_off00014780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14780 11820 bytes
SHA-256: 685de3d4c9a80ac438736f825f06a82c7177562b6e8de925bac883d63a0ef685