Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbe559870cc452f…

MALICIOUS

PDF

84.5 KB Created: 2021-03-23 12:14:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c119f2268b8d1b069ac523e81532170f SHA-1: 9a3ca67143d3a3e231b871ef76f009f3cc683556 SHA-256: ddbe559870cc452f576f4821aa6d6828263b35c5d17b99d0d4183ba7113209ea
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 0.9993

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://soxebez.ru/wix?keyword=lj+alleman+summer+school PDF link annotation
    • https://cdn.sqhk.co/xewasejeve/jcj49hf/audio_aula_de_ingles_gratis.pdfIn PDF document text
    • http://bezerojiw.scienceontheweb.net/morphological_characteristics_of_fungi.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/dRYgeje/dominoes_game_sold_near_me.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/lakikekow.pdfIn PDF document text
    • https://mapaforidax.weebly.com/uploads/1/3/4/0/134012560/kibijupana-fogogubo-xarojolu.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/h0dnib7/19876218851.pdfIn PDF document text
    • https://cdn.sqhk.co/lakisitu/dNhfChj/47194583336.pdfIn PDF document text
    • http://degimogug.mypressonline.com/invertebrate_zoology_practical.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/kenowotefutoz.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/tp-link_tl-wa850re_user_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/h7ig0gh/61957256650.pdfIn PDF document text
    • http://lovojat.22web.org/gadowedaxowumilajabij.pdfIn PDF document text
    • https://cdn.sqhk.co/nujusowidom/bGgiibn/rasudutexilijituxuguti.pdfIn PDF document text
    • https://cdn.sqhk.co/takulowizi/gheQvij/kapwing_convert_gif_to_video.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/begunexa.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/3c0cb11d-924d-43f1-a6d3-63e4570ada44/how_to_set_an_automatic_lamp_timer.pdfIn PDF document text
    • http://pitefabe.epizy.com/how_to_access_walgreens_storenet_from_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0cf2b93-d768-412a-8407-92d38074e4cd/do_ws_look_bad_for_medical_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a28a420-6687-44e4-bee2-c63d562a25d5/72190016531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae344f6-965d-4fc9-8d9a-c1f78e8535cf/11821814829.pdfIn PDF document text
    • http://talagolow.rf.gd/calendar_java_format.pdfIn PDF document text
    • http://muwalolerede.epizy.com/annihilation_of_caste_br_ambedkar.pdfIn PDF document text
    • http://kexejitevomosef.rf.gd/cell_culture_based_vaccines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45800ddc-19d7-4c87-8700-6c2f84eda8d1/88996847944.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_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 5056 bytes
SHA-256: cd946a5cffc40fa2cb3a278f762d5ac20039f29231934ad4b6069cb93fc7b3c1
font_01_sfnt_off00011dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFF 11388 bytes
SHA-256: 84ff131dd12565f9ed53eaf8fbfe9a0f591709d1bad2573163093ff03e8c61f1