Malicious PDF — malware analysis report

Static analysis result for SHA-256 187965d5997f9310…

MALICIOUS

PDF

39.2 KB Created: 2020-03-29 04:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f12250c1959aa2843f0656905c4a142c SHA-1: ba0be51d2ce310c286ea922b976d538334fd214e SHA-256: 187965d5997f9310263cf5b69b5df0e33ee846d5c7f1aaea96071ca0196f3286
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to other PDF files with numeric slugs, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the structure and heuristics point towards a malicious intent to distribute further content via these links.

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://aleonor1to1.com/uploads/1/3/0/4/130489377/130489377.html#the+adventures+of+huckleberry+finn+study+guide+answers+chapters+16-31
    • http://synergyesp.com/uploads/1/3/1/1/131163684/wopebele-viwofugigiserav.pdf
    • http://mail.global-taekwondo.com/uploads/1/3/0/3/130323155/fevivigopefa-nimoj-selelodopu-xiderikuxema.pdf
    • http://cbmusicandrepairguy.info/uploads/1/3/0/6/130622051/vumanaluxevezajen.pdf
    • http://mx.recordboxtruck.com/uploads/1/3/0/5/130588437/jidokizanopomi-kimokadakaw.pdf
    • http://littlebitoflavendar.com/uploads/1/3/1/3/131379559/zuxopomori.pdf
    • http://bestgrownco.com/uploads/1/3/0/6/130639436/lajatadi-denixikepojupi.pdf
    • http://since1984.co/uploads/1/3/0/2/130272381/puranotubupoxem.pdf
    • http://notchviewlasertherapy.com/uploads/1/3/0/7/130738797/6e90eb4fbf3.pdf
    • http://adrienneodell.com/uploads/1/3/0/6/130605104/af8cc00215d6.pdf
    • http://trimmerlawns.com/uploads/1/3/0/2/130272081/8227595.pdf
    • http://www.overlordcorp.com/uploads/1/3/0/6/130639038/4131343.pdf
    • http://www.matmassage2016.com/uploads/1/3/0/5/130588433/fe7d1ef.pdf
    • http://dynamixhls.com/uploads/1/3/0/7/130776063/d128dd.pdf
    • http://chronicwellnessexpert.com/uploads/1/3/0/5/130541600/roxuwuw.pdf
    • http://laurensfashion.com/uploads/1/3/0/2/130273944/52000e34728.pdf
    • http://honeybrookhomeinspectionllc.com/uploads/1/3/0/6/130604575/fifivutigakaruxetu.pdf
    • http://mealkitmama.com/uploads/1/3/0/2/130274154/591880.pdf
    • http://transparenttransformations.com/uploads/1/3/0/3/130379711/1fd161e5b530.pdf
    • http://phillipjaffepga.com/uploads/1/3/0/7/130776363/79bfe2351f52d3.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_off000070f4.bin
0a02ec0f73a6b8f361a9dbcaff749d88149281feb3df1383e84bf055fbd43be3
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F4 7684 bytes