Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfce38a0e45c32e…

MALICIOUS

PDF

47.3 KB Created: 2020-03-09 04:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4c18489eb293f2bb3d6a7234a46dcaa SHA-1: 6b94b738e70aabc35535a4ed3fbdf4fe209d0b14 SHA-256: fbfce38a0e45c32e8b05a07621e85c538d1b940c10915a2a60666e7732c68b9a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named and hosted on domains that appear to be part of a link farm. The document body, though partially garbled, contains a URL that is also present in the heuristics. This suggests the primary purpose is to direct users to external, potentially malicious, websites. No scripts were extracted from this sample.

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://855bet.lucky1st.com/uploads/1/3/0/4/130476743/130476743.html#how+to+calculate+mean+and+standard+deviation+for+grouped+data+in+excel
    • http://reconstructivewellness.com/uploads/1/3/0/2/130271103/8567988.pdf
    • http://1287pictures.com/uploads/1/3/0/8/130813972/fupaxasu.pdf
    • http://mystfig.com/uploads/1/3/0/6/130640172/679ebc41.pdf
    • http://sherbetstreet.com/uploads/1/3/0/8/130814909/2346000.pdf
    • http://tonicoindio.com/uploads/1/3/0/7/130775655/reretojolon_wuluwo_rutasinodeluxuj_gulazijanaga.pdf
    • http://alfordtech.com/uploads/1/3/0/7/130775823/nubojolikebuxe.pdf
    • http://ccpropertyinvestment.com/uploads/1/3/0/6/130604126/217659.pdf
    • http://www.had18.net/uploads/1/3/0/7/130738764/5832457.pdf
    • http://artartine.com/uploads/1/3/0/7/130740202/8175559.pdf
    • http://coratoloassociatesllc.com/uploads/1/3/0/6/130620572/228bce.pdf
    • http://sexintegrity.com/uploads/1/3/0/4/130483616/9715143.pdf
    • http://sotirasllc.com/uploads/1/3/0/5/130589269/vuzusorozugo-wefipafe-jogigeribaj.pdf
    • http://mail.fingerprintart.me.uk/uploads/1/3/0/2/130272424/f53c63.pdf
    • http://troyyu.photography/uploads/1/3/0/7/130738913/rogividilefave.pdf
    • http://www.positivenutritionbypaige.com/uploads/1/3/0/7/130775378/gakexirigeva_xived_mimirofasabowo.pdf
    • http://therapistinrochester.com/uploads/1/3/0/5/130551971/2725786.pdf
    • http://www.polarplungebio227.com/uploads/1/3/0/4/130488410/dezupokekime-pufizaribibad-nelidefefomomo.pdf
    • http://rowstersoda.com/uploads/1/3/0/5/130550836/pivez.pdf
    • http://pogranichnik.store/uploads/1/3/0/4/130435701/5583048.pdf
    • http://www.asso-tocqueville.com/uploads/1/3/0/6/130622011/fupupavugetojifi.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_off00007987.bin
df342bfacc56ce8661b9a42fd5fae74c36521828e4df01982f050cd81f0fd16c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7987 8288 bytes
font_01_sfnt_off00009989.bin
57b11507310a54ac1804785031a6c50e3b77163964f97d9b63d647909f1b8434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9989 16088 bytes

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