Malicious PDF — malware analysis report

Static analysis result for SHA-256 de813fae66af367d…

MALICIOUS

PDF

32.6 KB Created: 2020-06-08 02:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cab5672e66eeeb7c77fa6049a506b20e SHA-1: 2ef0a917172e96874cab3869f388dddf3bb11d47 SHA-256: de813fae66af367d51c64db2113c8ba7d544e1a40986222320033516a1711fa6
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text related to 'Bearing specification skf pdf' and mentions wkhtmltopdf, suggesting a potential lure for technical documents. The primary attack pattern involves directing users to numerous external URLs, likely for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://southbendwarehousing.com/uploads/1/3/1/0/131070469/131070469.html#bearing+specification+skf+pdf
    • http://welloils.net/uploads/1/3/1/6/131637046/1793279.pdf
    • http://sadieandthetradies.com/uploads/1/3/0/6/130621546/3184256.pdf
    • http://oneagonescience.org/uploads/1/3/0/2/130272513/7217094.pdf
    • http://deidredanielle.shop/uploads/1/3/0/7/130739987/wafedeveduju_petowujotikanez_wowunatonalo_dasemupiduli.pdf
    • http://mta-sts.mail.automower-centre.ch/uploads/1/3/1/4/131408999/5674718.pdf
    • http://myovisioninfo.com/uploads/1/3/1/4/131453465/39dd03689e5f.pdf
    • http://memoriescapturedbymeghan.com/uploads/1/3/1/6/131636587/36abfa0.pdf
    • http://fabiolasaglimbeni.com/uploads/1/3/0/7/130740533/wilenoxewujasakor.pdf
    • http://callpaullandscaping.com/uploads/1/3/1/3/131398459/kavefunereb-nusuwugovurixud-vulikosofal.pdf
    • http://fsuseniorhealth.org/uploads/1/3/0/5/130550777/jirixifazonoto-rosagop-putotomo-vavaruvebul.pdf
    • http://lifebalanceyogawellness.com/uploads/1/3/0/2/130274319/biwod.pdf
    • http://buildingourcommunities.com/uploads/1/3/0/6/130620464/23ad0d7d1f51c.pdf
    • https://nagimogiz.files.wordpress.com/2020/06/sozewigezafuzazazokom.pdf
    • https://latazedomev296862130.files.wordpress.com/2020/06/jafumomidanil.pdf
    • https://sufovivo.files.wordpress.com/2020/06/tubakikinadofagam.pdf
    • https://pufikono.files.wordpress.com/2020/06/53453081666.pdf
    • https://lusotadefel.files.wordpress.com/2020/06/13793912904.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_off0000587c.bin
fb6adbffc5913a727ca16dd1da19df5fe93c5d3f9b4200d8ebd145261f5fec82
pdf-font-stream PDF embedded font (sfnt) at offset 0x587C 8944 bytes