Malicious PDF — malware analysis report

Static analysis result for SHA-256 66302c9f5e86f3db…

MALICIOUS

PDF

42.1 KB Created: 2020-03-23 16:19:14 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8cddfe9e53a21230b72b92cd68c94d31 SHA-1: 06486467e026221f8bd3cb647b12d47eeb8e19d0 SHA-256: 66302c9f5e86f3db5749e773b41bf7f1ce5e2a0bbebe0cd458418e79ede03a15
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to other PDF files hosted on unrelated domains, suggesting a link farm or SEO spam tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs aligns with techniques used for phishing or distributing further malicious content. No scripts were extracted, but the sheer volume of external links is highly suspicious.

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://thebusinesstip.com/uploads/1/3/1/1/131164160/131164160.html#karcher+k+3.86+m
    • http://mybridgefinancial.com/uploads/1/3/0/6/130620522/9434aae30f.pdf
    • http://www.sunshineuniquedetailing.com/uploads/1/3/0/7/130775846/mipitav.pdf
    • http://dronkadiscountstore.com/uploads/1/3/0/7/130775751/5854410.pdf
    • http://sethslawnandgardencare.com/uploads/1/3/0/5/130588501/rolak.pdf
    • http://www.thesimplifiednews.com/uploads/1/3/0/2/130289310/481a87d4.pdf
    • http://vwmtexas.com/uploads/1/3/0/7/130738667/3924642.pdf
    • http://ailishbourke.com/uploads/1/3/0/8/130874408/giduwurur_xigetu.pdf
    • http://frecklemeister.com/uploads/1/3/0/5/130589099/3231464.pdf
    • http://hostmaster.cardiffbluessupportersclub.co.uk/uploads/1/3/0/8/130814718/rubadevuxadije-niriritupux.pdf
    • http://zrwbrothers.com/uploads/1/3/0/6/130621854/db3340e0.pdf
    • http://barnatstonewood.com/uploads/1/3/0/6/130605030/vivowiwegul_xumovisima.pdf
    • http://2handsstudio.net/uploads/1/3/0/3/130379169/823386.pdf
    • http://campkennedy.com/uploads/1/3/0/7/130776344/3015a0b00bb48.pdf
    • http://moderntechnique.net/uploads/1/3/0/5/130589331/9580522.pdf
    • http://www.comolakecdc.com/uploads/1/3/0/6/130621464/pakagoxewov_xezopafur_mikorotuzi_mixuwe.pdf
    • http://lowcountrymobility.com/uploads/1/3/0/3/130313741/lukif.pdf
    • http://mta-sts.theatreahs.com/uploads/1/3/0/7/130739023/nuxalonula.pdf
    • http://steepingleaves.com/uploads/1/3/0/7/130740053/kaloja_deduputigepenug_fudelexokijoro_sidigifowozeru.pdf
    • http://christinabeautyparlour.com/uploads/1/3/0/6/130603932/mamenisoko-wojem-buzufuvaruxi-vegosufij.pdf
    • http://weedagramqc.ca/uploads/1/3/0/2/130272925/1599882.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000664d.bin
c64fd1f583806f07cf25384cb6ad34f3fcd92ca7c09f72a301ae5c08f0103369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664D 7692 bytes
font_01_sfnt_off000083d4.bin
f84a0685d1f796786a0dfacc524128ee6d8366139368f127ddfa1e1ef4ee5ee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D4 16240 bytes

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