Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b99c21b9b7e09cf…

MALICIOUS

PDF

78.1 KB Created: 2021-03-22 21:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: eeae83c4fb443081a05294e3ca243d0d SHA-1: b21bfacd44e9dbc619d86f07efe88930357f1ee6 SHA-256: 6b99c21b9b7e09cf0976c9e1aaf7657eb86576e14d0ee06ae00b3a2dbc5bd093
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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

  • 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://kuzutuzo.ru/wix?keyword=french+revolution+video+unit+1+enlightenment+answers PDF link annotation
    • https://cdn.sqhk.co/moviferu/eiogf5b/population_ecology_definition_biology.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/fjjujfS/wozuz.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/9khaDkf/air_hockey_glow_2_player_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/giiahbp/52420491667.pdfIn PDF document text
    • https://vevorusafe.weebly.com/uploads/1/3/4/5/134516648/jufexofak.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/nsZhdjj/54397732290.pdfIn PDF document text
    • http://lapiwudoxavov.scienceontheweb.net/bakirabukukolos.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/ihoia12/learning_styles_inventory_for_college_students.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/chajcjj/pelvic_bone_anatomy.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/fiduwewi.pdfIn PDF document text
    • https://satotujum.weebly.com/uploads/1/3/4/3/134308249/60f6b70cc3d301c.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/Lxthijg/my_boy_emulator_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/ghgfjdA/16654662303.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/e5c1f322-b55f-4ce1-80d5-658791e2bacf/how_to_use_dog_gentle_leader.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/15986968253.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/powerukemawikukunubagan.pdfIn PDF document text
    • http://wilosokanik.myartsonline.com/bookkeeping_for_dummies_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46904cac-3d97-41c2-a22a-d2e3463e02d5/what_is_wifi_direct_on_a_brother_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc46ee6-c1d2-488a-ad26-980a888be1f9/strange_tales_from_a_chinese_studio_pu_songling.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/lixutajimevugerebususub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c988b24-c645-43b6-8753-5f082325b962/29610535603.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/pobonuliribivorimixeko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 5512 bytes
SHA-256: b4cfc28f61b5bc70583b93128cb23ba41b85dfe03eea73740ffc60d9aad619c7
font_01_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 1716 bytes
SHA-256: c0e39f44321a474cc328806e737293db5bfd2873d0430c567f64257ef24eb06f
font_02_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 10844 bytes
SHA-256: c21afb1e4474ed033050e79402a15c4acb01203646c399abf202105c07457fc0

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