Malicious PDF — malware analysis report

Static analysis result for SHA-256 668c1167e5c5c605…

MALICIOUS

PDF

42.8 KB Created: 2020-03-30 13:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a9de998e4fd0964c52a6958379d1dc8 SHA-1: b0b67060102cd0697bb12fd28540784d851181c4 SHA-256: 668c1167e5c5c605848f58dfac3148e82130484cf01521a631e3992766aa2ffc
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as a lure or a distribution point for further malware.

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://74-123-76-212.mgwnet.com/uploads/1/3/0/8/130814575/130814575.html#centimeter+to+meter+conversion+calculator
    • http://myndscentcompany.com/uploads/1/3/0/7/130740231/kugexusaraver-tomimi-zotod-kexevenes.pdf
    • http://craigabarber.com/uploads/1/3/0/9/130969310/111fa6657c5d91a.pdf
    • http://brannanschlitzbbq.com/uploads/1/3/1/0/131069899/355b7fb6dc53b.pdf
    • http://swiftcreekelectric.com/uploads/1/3/0/2/130272484/501e61.pdf
    • http://metroprointeriors.com/uploads/1/3/1/4/131408917/zirajavob.pdf
    • http://revitalizegreensboroga.com/uploads/1/3/0/3/130324370/xevazam_sajaz_nibixonuronip.pdf
    • http://yourfuturestartsathome.com/uploads/1/3/0/5/130544754/kopitunit-tiregedubomeno-zefidewefetewif.pdf
    • http://parth4cupertino.com/uploads/1/3/0/5/130552073/2495540.pdf
    • http://smscarpetcleaners.com/uploads/1/3/0/4/130483418/mepus-tabeguxipewevex-letilififubes-tewiz.pdf
    • http://agilepartnersllc.com/uploads/1/3/0/6/130621327/d59afa67.pdf
    • http://mcgadvertising.ca/uploads/1/3/1/3/131398113/zubotinulorofis.pdf
    • http://loveyouemanate.com/uploads/1/3/0/6/130604801/pedevusuf_tegoraxivofoto.pdf
    • http://www.cityviewclothing.com/uploads/1/3/0/9/130969331/lujedorak_wobeziseked_salopib.pdf
    • http://senasationalcbd.com/uploads/1/3/0/6/130639059/d11738e0e3c.pdf
    • http://victormdiaz.es/uploads/1/3/1/1/131164375/293b6406c.pdf
    • http://register10.com/uploads/1/3/0/7/130775589/meginizerowulu_gikuzenuz_tomipomabir_jesitawoxetozij.pdf
    • http://dipnetwork.info/uploads/1/3/0/7/130738513/2102879.pdf
    • http://sativic.com/uploads/1/3/1/3/131379774/mununutapiwo_fugufabijiv_winapusamab_fatajonuteve.pdf
    • http://bresumbrella.org/uploads/1/3/0/8/130814172/keletot.pdf
    • http://aerialonemedia.ca/uploads/1/3/0/3/130323817/savoduxali.pdf
    • http://peacockconstructionllc.com/uploads/1/3/0/9/130969983/suvidibeliji_gizunanorila.pdf
    • http://sommerjacob.com/uploads/1/3/0/5/130590305/ac5415.pdf
    • http://tapnetworks.com/uploads/1/3/0/8/130813906/8655403.pdf
    • http://mail.callbuddys.com/uploads/1/3/1/0/131069992/5d277be5b5b1.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_off00007a29.bin
2ea21cc467438d27c2aac5c4752d7dc1e383845d6113268b18e85871dbd6e581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A29 8716 bytes

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