Malicious PDF — malware analysis report

Static analysis result for SHA-256 282523ef6c75c793…

MALICIOUS

PDF

40.4 KB Created: 2020-03-30 06:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dc433f455fa41cdecc8767f4afbfeec1 SHA-1: 4fdd160bbfaf655b5de9ff868fec5075fdff33c1 SHA-256: 282523ef6c75c7930e55166ae141fa264e4b3bd03a8db3654cf53057d05ed338
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains URLs that are part of this link farm. This pattern suggests the PDF is used to manipulate search engine results or to distribute further malicious content via the linked PDFs.

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://yinghuangwangshangyule.br3h.com/uploads/1/3/0/6/130620469/130620469.html#potencial+electrico+y+ejemplos
    • http://hasaionline.com/uploads/1/3/0/3/130323286/8927641.pdf
    • http://cheekychis.com/uploads/1/3/0/6/130605230/davusirafupa.pdf
    • http://bouldercreekmeadows.com/uploads/1/3/0/7/130775744/367724.pdf
    • http://danieleporretta.com/uploads/1/3/1/3/131379738/9405852.pdf
    • http://ruefrancaise.com/uploads/1/3/0/5/130588150/abf73.pdf
    • http://andtheblackfeathers.com/uploads/1/3/0/9/130969965/jigirex-xelomupu.pdf
    • http://rtcommercialfloors.com/uploads/1/3/0/4/130476372/4532654.pdf
    • http://thepaintersfarm.com/uploads/1/3/0/2/130272994/2652795.pdf
    • http://latchment.com/uploads/1/3/0/8/130813692/83e82.pdf
    • http://sparkerisland.com/uploads/1/3/0/6/130621801/wazala.pdf
    • http://beaconmohs.com/uploads/1/3/0/7/130776078/3ce34fcc71eef0f.pdf
    • http://midnaetur.com/uploads/1/3/0/3/130379274/lowij.pdf
    • http://mail.support.famhealth.com/uploads/1/3/1/4/131438501/tuwoxupejusido.pdf
    • http://piper-boy.com/uploads/1/3/1/3/131381612/15c6ec77398.pdf
    • http://annagargani.com/uploads/1/3/0/2/130272271/batinekamas_nuzusom_fujikere.pdf
    • http://qspontario.ca/uploads/1/3/0/5/130541023/tiwiwuxidido_rinubija.pdf
    • http://northforktrees.com/uploads/1/3/0/5/130588493/2e09e937f.pdf
    • http://myessentialessences.com/uploads/1/3/0/3/130313702/zififixaw.pdf
    • http://doyouspeakaworldlanguage.com/uploads/1/3/1/3/131383767/ketawukizib-dokiziwetes.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_off000073ff.bin
01ae00f1c19c2725e774d16cbd6d7c470823449dea18ede55d44cbae80f2b4ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FF 8264 bytes

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