Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3937f2a0e214824…

MALICIOUS

PDF

40.3 KB Created: 2020-04-04 14:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 27e333b42ccc80e7c38ec33163520d67 SHA-1: 820ee14b6c13fe335fea986646ad1401d66efa0e SHA-256: f3937f2a0e2148240976c2f5580e06e6e988316b096f1a15ede50c07f187b651
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique commonly used for SEO link farming or to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. The document body text is largely garbled but contains a URL that is also present in the list of external links.

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://americathebeautifulandviolent.com/uploads/1/3/0/3/130323675/130323675.html#micromolar+to+mol%2Flitre+conversion
    • http://8sbowlingpubandgrill.com/uploads/1/3/0/5/130589102/bbfb996f77c18d2.pdf
    • http://seartiststudio.com/uploads/1/3/0/6/130620602/fufawevaten.pdf
    • http://elasticfive.com/uploads/1/3/0/7/130775475/zofebakibube.pdf
    • http://1loveconcert.com/uploads/1/3/0/5/130590243/1d0f6dd5b972470.pdf
    • http://armscointernational.com/uploads/1/3/0/6/130605383/bumogijodopej.pdf
    • http://58west58.com/uploads/1/3/0/5/130540214/xovojubirosaxiwes.pdf
    • http://hackyourbodymindandsoul.com/uploads/1/3/0/8/130813644/gibanonetum.pdf
    • http://maindogpetresort.com/uploads/1/3/0/6/130620626/8773285.pdf
    • http://kjmatosservicecorp.com/uploads/1/3/0/5/130588686/vezit_tonep_wamadunagakuvuj.pdf
    • http://peacesupportfund.org/uploads/1/3/0/6/130639651/kuzuwabaxesa.pdf
    • http://jsmythdesigns.net/uploads/1/3/0/5/130588931/ad26e7.pdf
    • http://fraulodde.com/uploads/1/3/0/6/130604795/dazud-tifonolewe-pedanijutida-zenumuzizu.pdf
    • http://riverratkreations.com/uploads/1/3/0/2/130289371/7847200.pdf
    • http://theclementines.org/uploads/1/3/0/6/130639298/6170774.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_off000069b6.bin
aca6cd12c49cf194cf5e2be5f0a6cdba8fa6f4eb820174fb81a08b493276d456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B6 7868 bytes
font_01_sfnt_off00008866.bin
cf2338b7895a3a873add1db7dfb411390262a2a3d24e5b3dccff59843624ea97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8866 2704 bytes

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