Malicious PDF — malware analysis report

Static analysis result for SHA-256 0052173501d57df2…

MALICIOUS

PDF

79.0 KB Created: 2021-05-17 00:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9075c15107841fd890b2743f5b4c1028 SHA-1: 88f593a0225aebfdf703178ceb870866ce14f36c SHA-256: 0052173501d57df2d592110e25f0632d45665c50f8249d063db6c1792b5bf212
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=xbox+360+wired+controller+driver+windows+10+download PDF link annotation
    • https://cdn.sqhk.co/sedazozesufu/gKhiggd/wuvupesupodemidegek.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/H4ggGic/sweet_flower_careers.pdfIn PDF document text
    • https://siropenisawad.weebly.com/uploads/1/3/4/3/134353493/bigafilabenuda-jezegevo-lotajirewotela-witetulof.pdfIn PDF document text
    • http://nubemeketetu.mypressonline.com/69860244125.pdfIn PDF document text
    • https://mibinataxufix.weebly.com/uploads/1/3/1/4/131438539/zivokedexim.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/36810029385.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/33009388438.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/bPEjcgc/83276687005.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/3075049.pdfIn PDF document text
    • https://jumemovelavubar.weebly.com/uploads/1/3/4/5/134516611/2aea284.pdfIn PDF document text
    • https://sokamokijajupi.weebly.com/uploads/1/3/5/3/135348419/4558976.pdfIn PDF document text
    • http://nunobuzipame.medianewsonline.com/lowedibux.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/49905ffd-386b-46bb-a4ca-54a2019f0230/41659060467.pdfIn PDF document text
    • http://tikimiwuwal.myartsonline.com/office_administrative_assistant_resume.pdfIn PDF document text
    • http://zasuwunal.myartsonline.com/46239312460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b706abc9-df6a-43fd-bcc5-81c804a797f5/44149191150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e567110c-a4e1-455c-a549-a38c9573c123/what_is_the_best_tracfone_smartphone_to_buy.pdfIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_96db430302e44caab427e74473bb1016.pdf?index=trueIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_87d478d388ca46ee8926b6deca38e1bc.pdf?index=trueIn PDF document text
    • http://gegilifopom.myartsonline.com/altissimo_alto_sax.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_6ae8c12b16cf4bf1a110198e05fa958a.pdf?index=trueIn PDF document text
    • http://vegubom.atwebpages.com/functional_analysis_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c9756a-4a95-489b-9137-f77891491dd4/58992877752.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_fbd399566bc444a0b3a0c81efcc4ea19.pdf?index=trueIn PDF document text
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_59aaf0ae4770462f807644a2c8075c9f.pdf?index=trueIn 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_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 5784 bytes
SHA-256: 779e01531cb357b798f693f0abf118129de503725b90ccef6d6045292a8fa949
font_01_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 10944 bytes
SHA-256: 7eba9c7c0f89986a01938cfe6878e85c049a8e05fbf492d87f2b1849199ca5a6