Malicious PDF — malware analysis report

Static analysis result for SHA-256 6735e3a598b6c33e…

MALICIOUS

PDF

38.7 KB Created: 2020-04-02 08:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e040b0cdbeed551747324dc025e9d81c SHA-1: 9930216a0c0e0df04735db868900c4b8310c198d SHA-256: 6735e3a598b6c33e424e7dc0c293abdc561096db2f5205d0bf9a8b1cb6ab2c5b
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO spam, designed to drive traffic to numerous external websites. The ML classifier strongly indicated maliciousness, and the PDF contains a large number of embedded URLs, many of which point to other PDF files. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content or phishing sites.

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://mujerplena.org/uploads/1/3/1/3/131383512/131383512.html#genero+lirico+soneto+ejemplos+cortos
    • http://sambanecafe.com/uploads/1/3/1/3/131398541/tejosulu.pdf
    • http://earlycollegehallco.org/uploads/1/3/0/6/130604288/nesofoba-badotosup.pdf
    • http://boodwah.net/uploads/1/3/0/6/130620929/b00e843b31.pdf
    • http://cawoodshope.com/uploads/1/3/1/4/131437223/200114.pdf
    • http://leodoesmakeup.com/uploads/1/3/1/4/131437100/rumawixuge.pdf
    • http://seomarketingcy.com/uploads/1/3/0/6/130605278/608f19d7cf.pdf
    • http://tanyapinto.org/uploads/1/3/0/7/130738805/2611689.pdf
    • http://saraantin.net/uploads/1/3/0/8/130874580/3038276.pdf
    • http://totallookhairco.com/uploads/1/3/0/6/130621203/45512b26.pdf
    • http://sprinklesweets.com/uploads/1/3/0/9/130968917/jabupifareg.pdf
    • http://turnofthewheelzines.com/uploads/1/3/0/7/130776719/liniv.pdf
    • http://365superiortraining.com/uploads/1/3/0/6/130605179/datujugojuzeluxuso.pdf
    • http://robbiebaldwin.com/uploads/1/3/0/6/130604456/mokagetire_gukoz_zuwewowux.pdf
    • http://yiechan.com/uploads/1/3/0/7/130740573/4791160.pdf
    • http://junkmarketgypsy.com/uploads/1/3/0/7/130775763/4295337.pdf
    • http://strengthpluscardio.com/uploads/1/3/0/9/130969957/berolalew.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c16.bin
429b077aaf1e0339afc1525594823fa11b567b08f598cea12ef6fcdcb58bc24a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C16 8800 bytes

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