Malicious PDF — malware analysis report

Static analysis result for SHA-256 749b43ad50eb6d34…

MALICIOUS

PDF

56.1 KB Created: 2020-03-23 16:21:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c142e09bb5e0ff9af41d8154da65fff9 SHA-1: 0f712614ad2425f2c6808f87277417e079080f3c SHA-256: 749b43ad50eb6d34e608626bc83657899d840ccaed95e30c87905bb87d3dda19
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file contains a large number of external links to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a link farm or content distribution network, potentially used to host malicious payloads or engage in SEO spam. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://yourwaterfall.net/uploads/1/3/0/5/130550880/130550880.html#common+app+prompts+2015
    • http://sewdivinecreations.com/uploads/1/3/0/3/130323377/fowejutalazuvuf_fiwalam.pdf
    • http://felicityspeechlanguage.com/uploads/1/3/0/4/130483781/4641455.pdf
    • http://somersetparkhoa.com/uploads/1/3/0/5/130588463/jotodewoja_fugadowejuxojuv_rafexifutusigur.pdf
    • http://bonaguahhi.com/uploads/1/3/0/4/130436521/xivelo.pdf
    • http://www.tn-estate.com/uploads/1/3/0/6/130639811/ef766.pdf
    • http://truedefdentallaboratory.com/uploads/1/3/0/5/130588289/tofelaletulu.pdf
    • http://gonzamed.pl/uploads/1/3/0/4/130488396/mured_depedafaxijumom_newikajegeg.pdf
    • http://flowdoser.info/uploads/1/3/0/3/130379051/kidewumepe_pamudezofuni_sewevojabo_mogum.pdf
    • http://villannabella.com/uploads/1/3/0/5/130544953/307583.pdf
    • http://hostmaster.digitaltidy.com/uploads/1/3/0/5/130546804/tesavorepuxu-bokisezadanas.pdf
    • http://333diamondwholesale.com/uploads/1/3/0/5/130588651/mogikuletunuvexu.pdf
    • http://indigenousmasculinities.com/uploads/1/3/0/5/130551864/7856948.pdf
    • http://www.rsc-industry.com/uploads/1/3/0/5/130551241/2d875822c.pdf
    • http://quantuminstruments.com/uploads/1/3/0/4/130488974/ramozopakixez.pdf
    • http://www.gaffneygritacademy.com/uploads/1/3/0/7/130738543/bokexori.pdf
    • http://www.massageclinicqt.com/uploads/1/3/0/3/130379121/gajezano.pdf
    • http://physicaltherapysherron.com/uploads/1/3/0/4/130476262/1276354.pdf
    • http://www.caritas-veveyse.org/uploads/1/3/0/6/130640018/gudowajalebatase.pdf
    • http://mta-sts.gracebaptisttacoma.org/uploads/1/3/0/5/130551619/43b846a98e5422.pdf
    • http://susiestreats.com/uploads/1/3/0/5/130541186/2690456.pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd91.bin
4371d312938c1cadcbb6ef36ad63289b7f26c0dedc6c886c11696ff46d99a012		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD91 9168 bytes

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