Malicious PDF — malware analysis report

Static analysis result for SHA-256 85eaf1ef214add01…

MALICIOUS

PDF

38.3 KB Created: 2020-03-09 03:59:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6329952161e696a6a80beaa71a1cfe2b SHA-1: b5c8828a49bd90760c6ad92fe6649b6d4689dd67 SHA-256: 85eaf1ef214add01c03874cb0e30508b2336086406a1a5e917e77bc65a9546b7
104 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to other PDF files, masquerading as a resource for 'Introduction to human resource management'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs points towards a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adsl-63-204-18-28.benefitplans.org/uploads/1/3/0/7/130776630/130776630.html#introduction+to+human+resource+management+pdf+free+download
    • http://glenerincleaners.com/uploads/1/3/0/8/130813756/wakabixariturenaba.pdf
    • http://www.labor4bowman.com/uploads/1/3/0/6/130640155/xixukoragora.pdf
    • http://brick-fit.co.uk/uploads/1/3/0/8/130874252/5723238.pdf
    • http://webdisk.sacredeartharomatics.com/uploads/1/3/0/7/130776123/sedubis-dapam-pukotizix-xezirapaj.pdf
    • http://hirzelinteriors.com/uploads/1/3/0/4/130488691/ruparuxuxel.pdf
    • http://halpernproject.com/uploads/1/3/0/7/130775889/5423829.pdf
    • http://mail.reflexgames.org/uploads/1/3/0/6/130604079/kefif.pdf
    • http://fartlyfe.com/uploads/1/3/0/2/130272548/59ea169d6a13a9.pdf
    • http://immobiliere-mastronicola-olivier.com/uploads/1/3/0/4/130478520/6924840.pdf
    • http://www.a1mobilereno.com/uploads/1/3/0/6/130621969/bumenisota.pdf
    • http://questbusinesses.com/uploads/1/3/0/5/130546243/lonufazula.pdf
    • http://mta-sts.everyday-wines.com/uploads/1/3/0/5/130551021/4640042.pdf
    • http://webdisk.tigrecolorado.com/uploads/1/3/0/5/130590578/20a327d2b1298.pdf
    • http://taylorshurte.com/uploads/1/3/0/2/130272254/6334a65d504771.pdf
    • http://hostmaster.knealenotarypublic.co.uk/uploads/1/3/0/5/130588256/besux.pdf
    • http://hellobrynnpuzey.com/uploads/1/3/0/6/130621510/3132238.pdf
    • http://biggables.com/uploads/1/3/0/7/130738771/xudixu.pdf
    • http://10k-running.com/uploads/1/3/0/3/130379523/272788.pdf
    • http://fixitlb.com/uploads/1/3/0/7/130740590/kojit.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_off00006c72.bin
91a0157147878356cfbc027fd0ffaab7831369e50da7e4fed7792d7dd156afc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C72 7988 bytes

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