Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a255e18ff3183b…

MALICIOUS

PDF

78.9 KB Created: 2021-01-12 13:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 98761da83d4f5b72438d78e7394d1775 SHA-1: 93e34515976e5e32c1cffdcf7c796f90891770ef SHA-256: 47a255e18ff3183bb855edc36a01dfee7c00e185004df0c67e885baef0463753
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or SEO spam. The PDF_SEO_LINK_FARM heuristic specifically highlights the mass of external links, suggesting a coordinated effort to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=anoreksija+i+bulimija+pdf PDF link annotation
    • https://valogasode.weebly.com/uploads/1/3/4/3/134320371/9829074.pdfIn PDF document text
    • https://zodekunomaxuj.weebly.com/uploads/1/3/0/7/130739112/6565175.pdfIn PDF document text
    • https://site-1168192.mozfiles.com/files/1168192/daily_cleaning_checklist_format.pdfIn PDF document text
    • https://lusovajilabijix.weebly.com/uploads/1/3/5/3/135351537/fba7dc6e2d.pdfIn PDF document text
    • https://tuverasoxodos.weebly.com/uploads/1/3/4/7/134745130/mejuf.pdfIn PDF document text
    • https://kixatefibav.weebly.com/uploads/1/3/0/7/130776592/buninizumoxim.pdfIn PDF document text
    • https://site-1167953.mozfiles.com/files/1167953/55716343563.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/dutotetiz_tazekimuz_neziseb.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/8779425.pdfIn PDF document text
    • https://pakopigame.weebly.com/uploads/1/3/0/7/130738837/3703e2cf87b46ca.pdfIn PDF document text
    • https://site-1172367.mozfiles.com/files/1172367/boreziguzilorebebitoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 5256 bytes
SHA-256: 65288280d3984963dded3f71828a97003ac9a7698288a31110b0105a7c77f2c3
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 12232 bytes
SHA-256: 2353674eb2b7871ef3de0a1688d2a049541ead6c2be92accded198bf2bd2ddbc
font_02_sfnt_off00011f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F90 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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