Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebf861cf641a60f…

MALICIOUS

PDF

30.1 KB Created: 2020-04-27 01:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 21f24f0d657daf64927a69606c4e598c SHA-1: 31923e56f936b247bff8e452acded45681f2c9a1 SHA-256: 4ebf861cf641a60f30553149e5bcb430b17a71ebd192a6df273cdb2947a38626
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a high likelihood of malicious intent. No scripts were extracted, but the sheer volume of links suggests a delivery mechanism for further compromise.

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://wellwithacupuncture.com/uploads/1/3/1/4/131453657/131453657.html#82nd+jumpmaster+study+guide
    • http://jayandshay2018.com/uploads/1/3/0/6/130639061/c655528.pdf
    • http://liquidgoldcorp.com/uploads/1/3/1/4/131437878/pumixibafogolofo.pdf
    • http://4maplecreekfarm.com/uploads/1/3/0/2/130289570/jufati-lazopowoton-sanamaravaj.pdf
    • http://penthousepromo.com/uploads/1/3/1/3/131382395/f0cdff.pdf
    • http://neurosignalslab.net/uploads/1/3/1/6/131606597/tesebizejuxunej-limuz-lutovapatavaka.pdf
    • http://dema-engineering.com/uploads/1/3/0/2/130289494/sesox_xetuforomofufar_jurewerosim_fidujapelejuwa.pdf
    • http://hocobo.com/uploads/1/3/0/9/130969385/mopasefamegel.pdf
    • http://ng11cars.net/uploads/1/3/0/7/130738714/batuwebiwabime-pejudekal.pdf
    • http://blackunicornbeauty.com/uploads/1/3/0/7/130775796/22ce2ace5d99f5.pdf
    • http://bnblosangeles.com/uploads/1/3/0/7/130740143/878348a0a7cdc88.pdf
    • http://athomeanniversary.com/uploads/1/3/0/6/130639454/labilet-gazipuxulu.pdf
    • http://feeltheconnection.ca/uploads/1/3/0/6/130603710/8898207.pdf
    • http://mywolrdpgtv.com/uploads/1/3/0/6/130640107/bufexirizuno.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_off00005010.bin
cd2bf527a069f71be9e557cef72d9273f5d6a774e9f13f71d9022b7388154d72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5010 7196 bytes

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