Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce725976fef7c814…

MALICIOUS

PDF

76.3 KB Created: 2021-06-01 23:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d9e9fa23d29071a7c44585aa6e123848 SHA-1: 50c5f6ac4ae783ccff4b31b5a05e91d5fb5a0de0 SHA-256: ce725976fef7c8143c83d78f64ccad20468b15ce20fcc6c95e27b943efa4a538
126 Risk Score

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 0.9990

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://medvor.ru/pbw?utm_term=how+to+find+your+foundation+shade+online+maybelline PDF link annotation
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/5558234.pdfIn PDF document text
    • https://molozotupinomel.weebly.com/uploads/1/3/4/3/134340336/sirinisilitog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369146/normal_5ff695dadcb19.pdfIn PDF document text
    • https://xonidaxu.weebly.com/uploads/1/3/4/3/134319292/d54304.pdfIn PDF document text
    • https://tulopesonu.weebly.com/uploads/1/3/5/3/135318186/95bf6a9933cc3.pdfIn PDF document text
    • https://tovoginimu.weebly.com/uploads/1/3/4/3/134379987/1462048.pdfIn PDF document text
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/8792743.pdfIn PDF document text
    • https://datagoso.weebly.com/uploads/1/3/4/7/134718767/tofifazujotelidusab.pdfIn PDF document text
    • https://lazarenebuf.weebly.com/uploads/1/3/4/8/134885148/tadokefibumubo-kusejojapovopis.pdfIn PDF document text
    • https://xabanovodo.weebly.com/uploads/1/3/0/7/130739860/4721242.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/3921315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_600a8b7eb6e34.pdfIn PDF document text
    • https://watigubirokomud.weebly.com/uploads/1/3/4/3/134310871/nabid_tuzuxibegeraler_wudokapixozu_fowufa.pdfIn PDF document text
    • https://fewurigog.weebly.com/uploads/1/3/0/9/130969621/degilutafewuvub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490369/normal_5ff892e04e375.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kolasotosexu.pbworks.com/f/the_tenth_insight_audiobook.pdfIn PDF document text
    • http://feteselulo.pbworks.com/f/74961748468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26e0ee0-6f0b-4617-8227-591827a78906/24290407707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ec2aa4-d92b-47fa-987d-6412a5077c04/new_housing_laws_california_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4248e933-3261-430e-9b98-78979372a7d2/16848786187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e673397-65bd-44f7-a566-f52f89325db5/degomok.pdfIn PDF document text
    • http://pagorevet.pbworks.com/f/xokedodenovusupunokadapin.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/real_credit_card_generator_with_billing_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3736fbda-8a40-476c-bc41-4c8395d5d446/40886064182.pdfIn PDF document text
    • http://venatulafiz.pbworks.com/w/file/fetch/144425676/novio_por_una_noche_online.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_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 5440 bytes
SHA-256: a99f8e8cbf76643180f2f81f330134980ccf49e4f1abc29296112a311b099626
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 10404 bytes
SHA-256: 45935ac23aeabea9fdb2450334ad344937ae0acb5b2f0f9fd306885f3a03819c