Malicious PDF — malware analysis report

Static analysis result for SHA-256 3660bed323468e13…

MALICIOUS

PDF

54.2 KB Created: 2020-11-07 03:38:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 036f01d58ce5fdeb79eeb90b6e322094 SHA-1: 3e1b8c84d9005c48d4cf55096d76baca9c74a3e3 SHA-256: 3660bed323468e135a77dd0a4ed9003704cb86d8bdb6e3e57ec4799d511b4044
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which are to benign-looking documents. However, one critical heuristic identified a brand-impersonation credential phishing lure for Netflix, linking to a redirector hosted on Weebly. The document body contains obfuscated text and embedded URLs, suggesting an attempt to disguise its malicious intent. The presence of numerous external links, including the phishing lure, indicates a likely attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/pufaw.pdf.
  • 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://trafffe.ru/aws?keyword=examination+day+short+story+pdf PDF link annotation
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/pufaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_5f9435cb70ed3.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/6b9485.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetazino/pharmaceutical_aerosols_lecture_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/rdr2_wild_horses_ranked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/238fc28e-da16-4b6c-a6bf-7ecb8b204585/international_conflict_management_strategies.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/42984774590.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/the_study_of_orchestration.pdfIn PDF document text
    • https://xanafegeze.files.wordpress.com/2020/11/polukagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09a5540-6065-4cd9-b3bf-58e92ddddb21/another_word_for_revenge_beginning_with_a.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/wugazexija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9d2a86-21bb-40b4-8302-0ac9bdd5ca4b/christopher_hyatt_undoing_yourself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f56edbc0-4ee4-4a7a-bf98-f1605d93eaa7/96190745265.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/shell_shockers_io_unblocked_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61dfb95e-8975-4718-9dab-8dca82d163a6/american_pickers_episode_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/44065016034.pdfIn PDF document text
    • https://app.hackernoon.com/drafts/ZmQf97nvbF0RIn 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_off000092c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92C5 5376 bytes
SHA-256: 20370ddf1708aec1bc85d704d0eabf524d8829f794409ca10e8496f45f760903
font_01_sfnt_off0000a4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4F3 11296 bytes
SHA-256: 72da1af18625d69199a520f8d21ed09875e501a5f7d2c8aa278b2c6d5401d13c

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