Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b50ccdf12970eda…

MALICIOUS

PDF

41.4 KB Created: 2020-06-04 19:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d82622156682ca3c7d9095b85fdf01e8 SHA-1: f33ec69b3898b3bef193c338e8feeb68e577243b SHA-256: 3b50ccdf12970eda6eb2915bf310e9ce10db2e9cd9203bfdf52c60a29de9e56f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external links suggests a delivery mechanism focused on redirecting the user to potentially harmful content hosted on external 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://wealthynhealthy.net/uploads/1/3/0/7/130776346/130776346.html#sistemas+dinamicos+ejemplos
    • http://capfitzlaw.com/uploads/1/3/1/3/131384227/lexetulezor.pdf
    • http://quantumpath.org/uploads/1/3/0/2/130289564/495728551b1af.pdf
    • http://humanevolutiondesign.com/uploads/1/3/1/4/131453432/383898.pdf
    • http://entourageentertainmentservices.com/uploads/1/3/1/4/131438758/woraliv-samoli-fuzetinaninap.pdf
    • http://freshflamecandles.com/uploads/1/3/0/6/130621683/7053849.pdf
    • http://my-lose-fat.com/uploads/1/3/0/3/130379356/e723c72d.pdf
    • http://myprovidenceconstruction.com/uploads/1/3/1/8/131871583/vanabogajawonug.pdf
    • http://tradeaffaire.com/uploads/1/3/0/4/130483393/260421.pdf
    • http://wealthynhealthy.net/uploads/1/3/0/7/130776346/terms.html
    • http://wealthynhealthy.net/uploads/1/3/0/7/130776346/dmca.html
    • http://wealthynhealthy.net/uploads/1/3/0/7/130776346/policy.html
    • https://womimoxik.files.wordpress.com/2020/06/59790208046.pdf
    • https://zelidazi.files.wordpress.com/2020/06/86320094931.pdf
    • https://bexemonul.files.wordpress.com/2020/06/nivisarusosim.pdf
    • https://mezigofi.files.wordpress.com/2020/06/3683262253.pdf
    • https://negoxojes.files.wordpress.com/2020/06/102354169.pdf
    • https://mosufazu.files.wordpress.com/2020/06/96861821736.pdf
    • https://ruzosegisax.files.wordpress.com/2020/06/72879435626.pdf
    • https://dupopopuf.files.wordpress.com/2020/06/77343822286.pdf
    • https://baxebebuv.files.wordpress.com/2020/06/sijeteloxuxureronin.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/
    • https://bexemonul.files.wordpress.com/2020/06/nivis

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007329.bin
84c47f7d22a2c9d1b1fc4c845c36684d0ea8c6d6e891a2ac65f0e5e9ee237d9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7329 11388 bytes