Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51b089ccf34cdba…

MALICIOUS

PDF

46.4 KB Created: 2020-03-29 10:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c701a8dc420373b4b0da80f7f8a5d6c7 SHA-1: 100f4b4a02a13a53e077a95da22029342514292d SHA-256: b51b089ccf34cdba066a26b2bc0da6c298d90af75baed9df244e1cf214c35fbd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The document body text, though partially obfuscated, contains a URL that is also listed among the extracted IOCs, reinforcing the malicious intent of redirecting users to potentially harmful websites.

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://74-123-75-90.mgwnet.com/uploads/1/3/0/7/130776110/130776110.html#dolor+musculos+del+cuello+delante
    • http://router.chemtech.pl/uploads/1/3/0/6/130639443/nisira.pdf
    • http://ivoryandoak.org/uploads/1/3/0/9/130969284/regizupoto-dodagede.pdf
    • http://cindylacy.com/uploads/1/3/0/6/130604951/f22af47f2c.pdf
    • http://savanahjkingcade.com/uploads/1/3/0/8/130813132/pexosinedariko.pdf
    • http://www.morgancontractorsllc.com/uploads/1/3/0/4/130489228/xadogemejota.pdf
    • http://republic-software.com/uploads/1/3/0/3/130324119/ragimabokutijalulode.pdf
    • http://dns1.en-linea.com/uploads/1/3/1/0/131070566/kenarukikegero.pdf
    • http://lotusnutritionandwellness.org/uploads/1/3/0/6/130620976/4578052.pdf
    • http://cwbwakeboards.com/uploads/1/3/0/7/130775536/wexaninujib-lowovafola-famixebam.pdf
    • http://trentsandifur.com/uploads/1/3/0/6/130621814/8560847.pdf
    • http://viabahia.net/uploads/1/3/0/9/130969175/mavowamutasawimop.pdf
    • http://cpanel.summitridgeguides.com/uploads/1/3/0/6/130605387/eb54e2.pdf
    • http://10kin30daysonline.com/uploads/1/3/0/5/130589397/8de1a258b49693.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007553.bin
30902ee93fd70af2e2a1bdd1e7bdaed267ae960ca96ee9ea02327b02426dd026		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7553 9000 bytes
font_01_sfnt_off000095f3.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F3 16036 bytes

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