Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb95baebb0023701…

MALICIOUS

PDF

67.3 KB Created: 2021-06-06 09:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 315171f369a135cdde9de7681b0ae036 SHA-1: c836b14b89f25f45d8ecbfa385498bdcfc236c7c SHA-256: fb95baebb0023701ef9a218439f6a73bb63a32b76ca828c06a4e397d85702480
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier strongly indicates maliciousness. The embedded URLs are likely used to redirect users to malicious sites, potentially for phishing or malware distribution.

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://laborke.ru/pbw?utm_term=chapter+8+cumulative+review+answers+algebra+1 PDF link annotation
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/gawakonaborika_tozerape.pdfIn PDF document text
    • https://nukafubesogu.weebly.com/uploads/1/3/4/4/134463640/7715159.pdfIn PDF document text
    • https://torofijode.weebly.com/uploads/1/3/5/9/135978969/8665667.pdfIn PDF document text
    • https://lobekopaxukibo.weebly.com/uploads/1/3/1/4/131453735/todagulogotaluga.pdfIn PDF document text
    • https://tiritezolodimim.weebly.com/uploads/1/3/4/7/134743729/278417.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/rokel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_6018065342b8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_603b17b17c2ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_5fd83fc61bf6d.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/72a1ccb5-8343-462c-8cb1-6eb4b8b986b7/62369609563.pdfIn PDF document text
    • http://mituxap.pbworks.com/w/file/fetch/144424242/what_is_the_difference_between_absorption_costing_and_variable_costing_chegg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be87ff54-a253-4282-b15f-de9200220495/que_es_un_campo_semntico_y_ejemplos.pdfIn PDF document text
    • http://fixiguru.pbworks.com/f/hobby_lobby_promo_code_for_sale_items.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/f/jikixojikisevalokopu.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144564051/revue_technique_citroen_c3_1.4_hdi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2492cf4-b8db-46a1-8103-3acc99f1bf0f/rufasogofipeban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a6239b-9026-4265-8795-39ce07a5be46/zofoxekafurowudogageni.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/pandas_get_first_row_of_multiindex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb77392-6c78-465a-b16d-623c36ca131f/what_alice_forgot_wikipedia.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_off0000c8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 5788 bytes
SHA-256: c1bf36cb67749bf1afaf90fc463adb77dc94a263b42f401313d86a9606ecdc5b
font_01_sfnt_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 10588 bytes
SHA-256: 5d9f42318b986423eac2c55fe75128f717f414a578448d6e6237a815ba7f226b

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