Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5fec9592dba849…

MALICIOUS

PDF

35.7 KB Created: 2020-03-29 07:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fa4cf11dd5718f4a2fe20d85136d1a05 SHA-1: 2e6a8e4d07020316bd00c5a5c871daa28275bdfd SHA-256: 7d5fec9592dba849c54531b921de46c197235f63ff4b214d9c4120dc2ce989dd
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains a large number of external links, many with numeric slugs, suggesting a link farm or SEO spam tactic. One of the embedded URLs, http://74-123-75-152.mgwnet.com/uploads/1/3/0/2/130287284/130287284.html#kidkraft+dinosaur+train+table+set, appears to be the primary lure. No scripts were extracted, but the extensive linking pattern is highly suspicious.

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://74-123-75-152.mgwnet.com/uploads/1/3/0/2/130287284/130287284.html#kidkraft+dinosaur+train+table+set
    • http://artwithann.net/uploads/1/3/0/5/130542865/6100998.pdf
    • http://richardmolyneux.com/uploads/1/3/0/7/130740596/sisaxewenozukawex.pdf
    • http://adaptable.com.au/uploads/1/3/0/8/130874049/mesifan.pdf
    • http://shopdevourdesserts.com/uploads/1/3/0/6/130620584/metudevebefe.pdf
    • http://bridge623.com/uploads/1/3/0/2/130288861/jirunapifopo_vuxub_womojifosa_gusomi.pdf
    • http://pawesomedogs.co.uk/uploads/1/3/0/6/130639815/6477833.pdf
    • http://alumni-chiropractic.com/uploads/1/3/0/8/130815115/4981231.pdf
    • http://desiklips.com/uploads/1/3/0/3/130379126/a5e76e287e475.pdf
    • http://mail.inezhedges.com/uploads/1/3/0/8/130874207/zazowida.pdf
    • http://just-done.com/uploads/1/3/1/1/131163851/fijetolino.pdf
    • http://orlandodreamholidayvilla.com/uploads/1/3/0/7/130775987/nurujirekenomagewur.pdf
    • http://chinamininggroup.com/uploads/1/3/0/7/130776111/delalulixiwuxivavi.pdf
    • http://tastycarolskitchen.com/uploads/1/3/0/7/130738814/2801259.pdf
    • http://andyzeffer.com/uploads/1/3/0/4/130436315/kuruxuvu.pdf
    • http://prosperitylawcenter.com/uploads/1/3/0/5/130589044/gaginezomopuxufidave.pdf
    • http://hi-tonewireless.com/uploads/1/3/0/2/130274345/a43bf51dc950a3d.pdf
    • http://roseg.net/uploads/1/3/0/4/130435943/tunopalamu.pdf
    • http://www.katrinaplamondon.com/uploads/1/3/0/4/130478566/gitelam_bisen.pdf
    • http://www.kaubleskritters.net/uploads/1/3/0/4/130489776/sifetulosod.pdf
    • http://heatherannfink.com/uploads/1/3/0/5/130545698/2699835.pdf
    • http://taksipalvelusarmatpelit.com/uploads/1/3/0/9/130969384/762ecc439f.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_off000063e6.bin
ed90ea2d28adcf60095fc0d6c2c3bfef73c5092f08a56e6e23615009a50b43bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E6 7040 bytes

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