Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c50f2f31e96ea12…

MALICIOUS

PDF

52.9 KB Created: 2020-04-07 13:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bc549eac73f69492e693ee3974743252 SHA-1: ac10a8627c07bfcd4fa91d91e6d9b8587b182489 SHA-256: 5c50f2f31e96ea12002a9c29a0041d4ebd3fe1eaa455e9f83f555ef2fd1edca7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content across multiple sites. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm the presence of a link farm and embedded URLs. No scripts were extracted, but the sheer volume of outbound links suggests an attempt to redirect users to potentially harmful content.

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://testingoutasitebuilder.net/uploads/1/3/0/2/130270872/130270872.html#formulas+de+fisica+1o+ano
    • http://kwlcustomrentals.com/uploads/1/3/1/1/131163955/xipipupalanimox.pdf
    • http://kiplinganimalhospital.com/uploads/1/3/0/3/130323301/0505fb3d.pdf
    • http://hmgraphics.info/uploads/1/3/0/2/130289813/259bfea5d.pdf
    • http://elijahedavis.com/uploads/1/3/0/6/130621908/5970032.pdf
    • http://aceintheholeentertainment.com/uploads/1/3/0/6/130621077/64693.pdf
    • http://newalbanydistrict.org/uploads/1/3/0/8/130874379/5837310.pdf
    • http://ewbwpp.org/uploads/1/3/0/5/130539843/divibafelosarok.pdf
    • http://philgoldmanphoto.com/uploads/1/3/0/6/130639254/cce6edcc35bbd20.pdf
    • http://natationlaval.com/uploads/1/3/1/4/131483447/8009345.pdf
    • http://margosuppliesoperationsmanual.com/uploads/1/3/0/6/130621606/dedak-futebilakixurel.pdf
    • http://dlvafrica.com/uploads/1/3/0/8/130814110/f7932e9f.pdf
    • http://stewartstreetbc.com/uploads/1/3/0/2/130288682/lanivap-sexabafaxolif-wosux.pdf
    • http://fiznip.com/uploads/1/3/1/3/131380320/rugiwus-nukuxati-laxokudu.pdf
    • http://justaquiltinggeek.com/uploads/1/3/0/9/130969806/kiwexexu.pdf
    • http://colorblind.tv/uploads/1/3/0/5/130589297/3097651.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c46.bin
c4d98d05dfbdaa601b731cabea26df0beb33a072582b1807518115ea75837954		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C46 10416 bytes
font_01_sfnt_off00009ec2.bin
56f5c0b5d8a01f5879376b6d9a8e2950791c99512776026831026aaee3aa93d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC2 4636 bytes
font_02_sfnt_off0000ae6c.bin
029be3e452b431926cf4cbde7b33e5817c9ef2ecfcd80938b9591ade19b8b237		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6C 16232 bytes

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