Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae30211649ddd8d0…

MALICIOUS

PDF

37.7 KB Created: 2020-05-21 18:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2603cc20d372239da9a566555041f294 SHA-1: c3b47525ec16890938f89707b7e7311a3f51b391 SHA-256: ae30211649ddd8d0e15f7e804319c0ef94e57fa0fb2d79bd0f9e94d52810f9c4
96 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to other PDF files. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links, suggesting a tactic to distribute malicious content or engage in SEO spam. The document body text, though garbled, contains a URL that is also present in the list of extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://1bi.undesirable.us/uploads/1/3/0/6/130639693/130639693.html#physics+of+the+human+body+herman+solution+manual+pdf
    • http://coolerrealestate.net/uploads/1/3/0/8/130813762/a30ad0.pdf
    • http://john-kuniversal.com/uploads/1/3/1/6/131637027/a4b3bc6.pdf
    • http://kimkerrmft.com/uploads/1/3/1/3/131384599/6944665.pdf
    • http://lindsayshojimakeup.com/uploads/1/3/1/0/131070674/9315315.pdf
    • http://idahofallscleaningservices.com/uploads/1/3/0/7/130739720/zuxosalopul_jomoz.pdf
    • http://renewyourjoy.com/uploads/1/3/0/6/130639808/bijedu.pdf
    • http://amajunstrabageaua.com/uploads/1/3/0/5/130588206/nabarumata_kadageku.pdf
    • http://spechicago.net/uploads/1/3/1/4/131438592/3f7d2.pdf
    • http://tsonlinetrading.com/uploads/1/3/0/4/130488114/15f1b98183.pdf
    • http://celiaannevents.com/uploads/1/3/0/5/130550769/1c6f4da3.pdf
    • http://nucleoama.com/uploads/1/3/1/3/131398545/ragagewekax_zurixifozewum_filutin_zamuganiwoxu.pdf
    • http://hairandmakeupbysusana.com/uploads/1/3/0/6/130621937/rigovulebidew-rubuvomozegix-gomima.pdf
    • http://foodhubonline.com/uploads/1/3/1/3/131398085/8422776.pdf
    • http://block1949-asu.com/uploads/1/3/1/4/131438234/xofavixo-rosiden-milelu.pdf
    • http://shebykei.com/uploads/1/3/1/3/131398064/1d4dcc4.pdf
    • http://thehadlowtower.com/uploads/1/3/0/9/130968917/8563252.pdf
    • http://compa.io/uploads/1/3/1/3/131379781/2f742e6.pdf
    • http://ritetrainings.org/uploads/1/3/0/7/130776745/1089223.pdf
    • http://jolantapilinkaite.com/uploads/1/3/0/9/130969953/9a503d1534353.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_off000067b9.bin
845fc4b879196f329850f6de33e0f6bfe740ea18e4ec0c1fd6bb72feb3838f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B9 10324 bytes

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