Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aada3a8c455f2cf…

MALICIOUS

PDF

74.2 KB Created: 2021-03-29 10:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: b5b388aebfe165743b9d45048641bbfe SHA-1: e4b8940b05e286937559b11e55fd18240035fe36 SHA-256: 8aada3a8c455f2cf5f452907b2189e6f66c6db42cc60afb76504ae936938c25f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded links, such as 'https://soxebez.ru/wix?keyword=mcoc+mastery+guide+2018', likely serve to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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/wix?keyword=mcoc+mastery+guide+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459036/normal_605fadd81d7f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_6027cdad8e065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_6031ba532b3f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_60240cadc9a44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476302/normal_60078d082f47c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459645/normal_605d3069862ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365594/normal_6004ba15180ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411696/normal_605dc8299ca39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ratixifo/29863039443.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/catfish_farm_business_plan_executive_summary.pdfIn PDF document text
    • http://fixekemira.epizy.com/candidiasis_oral_scielo.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/56886797138.pdfIn PDF document text
    • https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_2047013597ab4bf48821cec74b8dc9a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/ear_bandage_procedure.pdfIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_0f2a7a126abc419c8616d36116cd04a0.pdf?index=trueIn PDF document text
    • http://pirefalanife.epizy.com/lovugomorofat.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_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 5856 bytes
SHA-256: fad906259e9c51e4ebbb14e4e2d0c4c6d1b275e7e6cd479bb9e149e52164091d
font_01_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 10924 bytes
SHA-256: a2c942e9f5eaabeb897c6053dc0424fe977538d7384ceaaad5002b39dced72db

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