Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b5ccdb237be502…

MALICIOUS

PDF

34.0 KB Created: 2020-04-08 02:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4aea6509ccd3a9967cc9b985322aa55 SHA-1: 4c484499911072eb2810669a8202ea8bcd5ebf90 SHA-256: 95b5ccdb237be502cc6bc93af66c6120c8497715eeabfb55615996ef026f9df1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

This PDF file exhibits characteristics of a link farm, with a large number of external links pointing to other PDF files hosted on various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. The embedded URLs likely serve as a lure to redirect users to potentially malicious content hosted on these domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://jasmineandyoga.org/uploads/1/3/0/4/130483772/130483772.html#new+year%27s+day+piano+sheet+music
    • http://suncitycharlotte.org/uploads/1/3/0/4/130476469/degifukeb.pdf
    • http://pdm1775.com/uploads/1/3/0/4/130488851/9300500.pdf
    • http://fabuloustouchdetailing.com/uploads/1/3/0/7/130776016/9065513.pdf
    • http://gomriz.com/uploads/1/3/0/5/130590368/kozafulub-tupopewiz-vuleti-melegunidurak.pdf
    • http://slivkallc.com/uploads/1/3/0/6/130605036/1883630.pdf
    • http://skylight24.com/uploads/1/3/0/6/130620556/vepivab-loliwapejo-pokuk.pdf
    • http://christinacerto.com/uploads/1/3/0/3/130313002/1900004.pdf
    • http://notanotherboutique.net/uploads/1/3/0/5/130545827/tovonajit-zesavatin.pdf
    • http://qingfengconstruction.com/uploads/1/3/0/4/130489102/zubawa-muziredok.pdf
    • http://caitlinsretreat.com/uploads/1/3/0/2/130289799/4920240.pdf
    • http://mogulmethod.com/uploads/1/3/1/3/131379700/5146241.pdf
    • http://mtdistrictlwml.com/uploads/1/3/0/7/130740193/113428.pdf
    • http://dutchdredgingsolutions.com/uploads/1/3/0/9/130969090/mugowemozusamif.pdf
    • http://bonificator.com/uploads/1/3/0/3/130379959/vopebolowejeb.pdf
    • http://zablanphotos.com/uploads/1/3/1/4/131437561/2540339.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054d6.bin
e165ea52916ae3d76c0b6407301d1e5df72b3e33ac26be9ad08cf2bfa705bca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54D6 6680 bytes
font_01_sfnt_off00006f88.bin
83d89f79375f7f339e88070a8779324ce221c94923bff415e388e162fbc46cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F88 2604 bytes

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