Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3e3b706c37e1d9…

MALICIOUS

PDF

41.1 KB Created: 2020-03-23 05:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b8c7740fc210e518a607f48971bcb3bf SHA-1: 3f13ae52cb17fce71034b0879f374d91bba3ae87 SHA-256: 6c3e3b706c37e1d90ce314242b2b53f93596d5002db281b26b5b9c36823ac881
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous SEO-like links suggests an attempt to manipulate search results or distribute malware. No scripts were extracted, but the PDF structure itself is the primary vector for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://thesoonernetwork.com/uploads/1/3/0/4/130488934/130488934.html#propiedades+de+los+vectores+en+el+plano+y+en+el+espacio
    • http://delbertsonrealty.com/uploads/1/3/0/5/130589094/1405015.pdf
    • http://wildernessnavigationconsultancy.com/uploads/1/3/0/8/130874475/3839514.pdf
    • http://jecproductions.com/uploads/1/3/0/2/130270874/1211721.pdf
    • http://amorimports.com/uploads/1/3/0/5/130589268/23172b79.pdf
    • http://canalsigling.com/uploads/1/3/0/6/130604993/2620893.pdf
    • http://www.whitmoreorless.com/uploads/1/3/0/5/130551338/b0264.pdf
    • http://aukstamford.com/uploads/1/3/0/7/130776407/8930434.pdf
    • http://shop.elishebahouse.com/uploads/1/3/1/0/131071047/0a35872654a7e.pdf
    • http://kajukenbo.online/uploads/1/3/0/4/130436450/motalapanetefigo.pdf
    • http://yuqingqiao.com/uploads/1/3/0/8/130813398/lowoguket.pdf
    • http://aceadvicetravel.com/uploads/1/3/0/7/130739751/d13fe.pdf
    • http://harlemdata.com/uploads/1/3/0/7/130776674/1806770.pdf
    • http://letsgeauxsomewhere.com/uploads/1/3/0/7/130776641/naridabema.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068de.bin
524c5d7f21e4559e0611055d2272696f5645c1ad46ba7e798832c7a7a7ef9ad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DE 9392 bytes
font_01_sfnt_off00008b2b.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2B 2652 bytes

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