Malicious PDF — malware analysis report

Static analysis result for SHA-256 604d57940d01cbe3…

MALICIOUS

PDF

48.6 KB Created: 2020-03-29 22:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 545bca78077501c70b166b2f04aa50e1 SHA-1: d48f787c2177c4fd441bf87f963d36372a1236ee SHA-256: 604d57940d01cbe3691bcd3890163d69ca81ef7d938d680649140bf671922f4d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or redirect chain, suggesting a spearphishing attachment used to drive traffic to potentially malicious 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://shogiforum.net/uploads/1/3/0/6/130605097/130605097.html#gilliam+asperger%27s+disorder+scale+2
    • http://harmonyglassbyrobert.com/uploads/1/3/0/7/130740444/7402065.pdf
    • http://schooolfixers.com/uploads/1/3/1/4/131437410/9e1f5.pdf
    • http://giveapencil.org/uploads/1/3/0/6/130639784/zeluxojejekeniz.pdf
    • http://laurayurko.com/uploads/1/3/0/3/130324136/6684685.pdf
    • http://alcidesrodriguez.com/uploads/1/3/0/4/130476492/wojadufok_juvakagip_mevizopod_wosevasik.pdf
    • http://springella.com/uploads/1/3/0/7/130775977/8258599.pdf
    • http://uptownhoneyllc.com/uploads/1/3/0/6/130639922/nogawegagavi.pdf
    • http://westshoreland.org/uploads/1/3/1/0/131069789/tugusopufan_ridaxo_livomigas_juxamejat.pdf
    • http://headhuntertaxidermynw.com/uploads/1/3/1/1/131163658/7473825.pdf
    • http://iasoaps.com/uploads/1/3/0/5/130590339/4769381.pdf
    • http://letlaura.net/uploads/1/3/0/5/130546717/girakuzoxa.pdf
    • http://lovelashesbypao.com/uploads/1/3/0/5/130590656/vipaxuwoxomuvote.pdf
    • http://findmeifyoubi.com/uploads/1/3/0/6/130620863/8978926.pdf
    • http://danieleporretta.com/uploads/1/3/1/3/131379738/9405852.pdf
    • http://nicolekingmusic.com/uploads/1/3/0/7/130775984/gurewifuwijoraduna.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_off0000939c.bin
53480004c25c18b6848a47916d8daa87af8ee9a0b39a92a6ab49d5fccf65c128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x939C 8836 bytes

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