Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b7d83d46f94d4d…

MALICIOUS

PDF

79.3 KB Created: 2021-06-03 01:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3780ce31980f9c7c6f791532e9a6ed42 SHA-1: 210ec8a71435184fc9bb40f376e874d76aae9e6a SHA-256: 19b7d83d46f94d4d747231a2cc874e3859dcc26689e5123d641f787ccab0c698
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 0.9998

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://nipisod.ru/123?utm_term=body+pump+class+format PDF link annotation
    • https://vegujuzemev.weebly.com/uploads/1/3/4/0/134017506/12ec31ff3.pdfIn PDF document text
    • https://xibupofuku.weebly.com/uploads/1/3/5/3/135306475/1223876.pdfIn PDF document text
    • https://joxefumisati.weebly.com/uploads/1/3/1/4/131406837/6405212.pdfIn PDF document text
    • https://xonatiwomunonow.weebly.com/uploads/1/3/1/8/131856992/2649672.pdfIn PDF document text
    • https://zinelenugep.weebly.com/uploads/1/3/1/6/131636957/8017074.pdfIn PDF document text
    • https://puzapageduz.weebly.com/uploads/1/3/1/4/131453954/de504de8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wepoline.pbworks.com/f/wevixedafesokav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21fb1ec1-874f-47ac-b557-9317c14744ef/what_is_an_interrogation_room.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a8407e0-990f-4094-8dca-a20645d0c47a/why_was_johnny_depp_pulled_from_pirates_of_the_caribbean_reddit.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/f/tryst_with_destiny_objective_questions.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/can_i_pet_that_dog_video_moonpie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6241b02a-4a11-4a01-8ab1-3d6ed87cb160/strength_and_weakness_of_differential_association_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39382dd3-cbf9-4710-88a3-b9d5db47934d/sole_s77_treadmill_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d884ba1-538a-4f91-9600-3532c23e50da/calendario_escolar_2020_aguascalientes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2fad01-460a-40a0-8862-b1880fb651ca/61313033514.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144441807/guxozetuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a8f839-6111-4178-9de4-b6352dc54188/how_to_find_gerudo_clothes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1a4b33-3d18-4d1b-a7bd-25e3e451568c/yeh_shen_video_part_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e5f162-799a-4450-9092-9c0d8238a44f/85568247983.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_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 5064 bytes
SHA-256: 3646a0c82f0c3da8380fcb1f063fbcf768cfb1c2d4d4ac4ffe1bc9c8def8065c
font_01_sfnt_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 10420 bytes
SHA-256: 4cbc8a9c2394092acae314398c32b2ccf04762a892e7011895f670cb973a12fa
font_02_sfnt_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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