Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed455f96787d0f78…

MALICIOUS

PDF

36.0 KB Created: 2020-03-20 08:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 24a9bbfb05a633eb79352f3525a47a1f SHA-1: 4cef38de6031d886da458434aedf9459e70f12ad SHA-256: ed455f96787d0f78943d60e017e5e8aa58f2908e087095eb1376854347dd1720
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though garbled, contains a reference to "Pictures side by side microsoft word" and includes multiple URLs, indicating a lure to external content. No scripts were extracted from this sample.

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://churchstrettontaxi.com/uploads/1/3/0/4/130483299/130483299.html#pictures+side+by+side+microsoft+word
    • http://www.alexandrarickard.com/uploads/1/3/0/6/130621673/fuvefa.pdf
    • http://biosphererights.com/uploads/1/3/0/3/130323324/4856863.pdf
    • http://hostmaster.positiveawards.co.uk/uploads/1/3/1/0/131070771/3c866.pdf
    • http://chinesefail.com/uploads/1/3/0/3/130312952/9ed0d.pdf
    • http://www.hissnthatexotics.com/uploads/1/3/0/6/130640172/efbd7aa1d5.pdf
    • http://nfloo.com/uploads/1/3/0/5/130551795/3d926f3ec0a.pdf
    • http://thebooklist.net/uploads/1/3/0/7/130740438/1209456.pdf
    • http://www.simplytc4me.com/uploads/1/3/0/9/130969260/biweme.pdf
    • http://ahanna.org/uploads/1/3/0/7/130739289/pelosizejadiri.pdf
    • http://noisymusic.org/uploads/1/3/0/4/130489044/6198886.pdf
    • http://monaconsultingservices.com/uploads/1/3/0/5/130588548/7589129.pdf
    • http://myluxecandy.com/uploads/1/3/0/7/130740623/363215.pdf
    • http://freddybeachswag.ca/uploads/1/3/0/6/130639059/4727799.pdf
    • http://www.pointcookhealth.com/uploads/1/3/0/5/130540021/xofurufu.pdf
    • http://mx.laser-therapies.com/uploads/1/3/0/7/130775879/totejunixuve.pdf
    • http://lifeback.org.au/uploads/1/3/0/4/130435518/zomefej_govudagemupesi_nuwozuzipiziso_wajozezowaru.pdf
    • http://kwarsmoothieshop.com/uploads/1/3/0/6/130604408/5958887.pdf
    • http://www.ainalaiyn.com/uploads/1/3/0/8/130874011/fowugosi-gudivuga-rejol-sopef.pdf
    • http://hostmaster.heinrichtoh.com/uploads/1/3/0/3/130313673/mebisi.pdf
    • http://fixing.team/uploads/1/3/0/6/130603688/gorosaxeg.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_off00006566.bin
0c5ad8fd6cf76c3b3c5ed5b12af311ed49fb2f07bdf1e65c287e8e6a9c3e3555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6566 7384 bytes

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