Malicious PDF — malware analysis report

Static analysis result for SHA-256 28624ddd017de569…

MALICIOUS

PDF

68.2 KB Created: 2020-12-11 03:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cd02e35d525b31a2bea113fd2f133121 SHA-1: feb7c72113eec90fca7894966cac673353307f24 SHA-256: 28624ddd017de569f0bb830e82783b268893be1c2b486336bd6438f851b2765c
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=personas+famosas+de+puerto+rico PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406775/normal_5fa97eef06742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5fac02c6eb4bf.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/834ae2.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/vanipavujubapim.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/girowuzibasi-kolulowometepuv-sopuguxipujir.pdfIn PDF document text
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/kuxiwu.pdfIn PDF document text
    • https://sazinuje.weebly.com/uploads/1/3/4/5/134588850/xatarerevojesulit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc2d4f52cf09257bd788e5f/t/5fc69599fa04221c710696cd/1606849946038/37219500905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99665a16-b032-45c6-a20f-dbb4550821ef/93145201150.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/52653653202.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2aa4c27a199023ac0c258/t/5fcca8852fa8bc6bcde4e306/1607248005996/big_baby_dram_age.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_off0000ccc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC6 5272 bytes
SHA-256: 90a7a35c96036b42f09456cf1db85a94b6da299234e7006d2b011cd94dcc809f
font_01_sfnt_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 11484 bytes
SHA-256: 27da48fbbc276a18b623c74369bef51820a1578517c4238ece80a425c894e3c9