Malicious PDF — malware analysis report

Static analysis result for SHA-256 86708fe39c20ecf8…

MALICIOUS

PDF

39.9 KB Created: 2020-06-10 13:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20d66f7e9a4750fe36272031dbb9699b SHA-1: 9a97a4d301734bd59d147907e5f017e1b5e3286c SHA-256: 86708fe39c20ecf87eac03861c1083cb703477851ff49e36067693e570ee1823
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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.
  • ClamAV: Pdf.Dropper.Agent-8741860-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8741860-0
  • 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://3xn.undesirable.us/uploads/1/3/0/5/130588527/130588527.html#ca%25C3%25A7ador+silencioso+4+lobos+do+pacifi
    • http://awoslc.com/uploads/1/3/0/7/130739214/ead0726fcd.pdf
    • http://tawnellhobbs.com/uploads/1/3/1/8/131856034/4497b210459615b.pdf
    • http://ikhouvanlampegat.nl/uploads/1/3/0/7/130775867/bb5b9ec4e8f08.pdf
    • http://ringsbyvia.com/uploads/1/3/0/5/130551256/4cd44039f.pdf
    • http://thetablegf.org/uploads/1/3/0/6/130639865/67d2761116bce.pdf
    • http://promobloc.com/uploads/1/3/0/7/130738596/rowiraxovetom.pdf
    • http://nerfbattleparty.org/uploads/1/3/0/5/130551967/ab071c5a5db.pdf
    • http://lightoftorahpilgrimage.com/uploads/1/3/1/0/131070888/zaruza_netep.pdf
    • http://vpn.comfortengineered.com/uploads/1/3/0/8/130874530/5507741.pdf
    • http://petroxholdingsinc.com/uploads/1/3/0/8/130813592/59001b7.pdf
    • http://74-123-78-212.mgwnet.com/uploads/1/3/0/5/130539373/zepazakutuzitum.pdf
    • http://vpn.stmartindp.com/uploads/1/3/0/6/130620972/fowosopa-ledepotutawa-nawuwimo-lofuziro.pdf
    • http://topnotch-hair-weave.com/uploads/1/3/0/6/130621790/kelujaxerulibaxokowe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tajarumomix495663631.files.wordpress.com/2020/06/rukesanatemazuleresapuja.pdf
    • https://kifumup.files.wordpress.com/2020/06/bawas.pdf
    • https://mupujinivibu.files.wordpress.com/2020/06/40875459566.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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a32.bin
1044e11d7b29699db9c8663f992c1df0971bf4c89272393b2eeda3dfc23813c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A32 12916 bytes