Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc457f425d6168b…

MALICIOUS

PDF

52.0 KB Created: 2020-03-13 04:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0643053548b1bf8235b1bc7171e15115 SHA-1: 12fb5bb20271a1c8038a2623cd39adf6094b2fba SHA-256: 7bc457f425d6168b304c026eeee2d7cd0b3156c14a0726cbc6761f7827014d2d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, which is indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially malicious content or to manipulate search engine rankings.

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://loganraeisrael.net/uploads/1/3/0/7/130775495/130775495.html#ayatul+kursi+mp3+download+video
    • http://imperialyorkies.com/uploads/1/3/0/5/130590393/kopuvodupefade.pdf
    • http://mamouniahaircare.com/uploads/1/3/0/3/130313567/pudifisumovul.pdf
    • http://www.chuckbarnestexas.com/uploads/1/3/0/4/130489253/9613658.pdf
    • http://redrivercleaningco.com/uploads/1/3/0/7/130739073/bamopagejarojim.pdf
    • http://preview.lifeskillswyo.com/uploads/1/3/0/6/130621359/gedopofuxo.pdf
    • http://www.the-ghana-project.com/uploads/1/3/1/1/131164261/morujuzimefom.pdf
    • http://mydhfastmandat.com/uploads/1/3/0/7/130775413/nirajeneluku_gazinezarem.pdf
    • http://www.wonkeymonkey.nl/uploads/1/3/0/7/130775107/patikanujev-vowezaruwelap.pdf
    • http://www.theforgottensongbook.com/uploads/1/3/0/6/130621979/mizubujafimubex-beloluvabet-xaxak-tuxilesatogej.pdf
    • http://74-123-73-138.mgwnet.com/uploads/1/3/0/6/130621202/6330992.pdf
    • http://www.beyondbliss.us/uploads/1/3/0/2/130287930/kavezekolenewo_zubapuna.pdf
    • http://mvspropertymanagement.com/uploads/1/3/0/2/130288579/lopaguvidup-rebeda-peragapol.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dab.bin
fb45cf6ca3b0a363d2d675bdccb4725257ed1914adb5f8da385882e50fedf2fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAB 8836 bytes
font_01_sfnt_off00008f05.bin
30a867c4acd2a4e3222ae24f96f870c3e770d75b3b8d4384e075e8f6c8c9ae71
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F05 17036 bytes
font_02_sfnt_off0000a78f.bin
b3a003443684839215b15f688380dc5ca9d71197619f210014bcb5a651240028
pdf-font-stream PDF embedded font (sfnt) at offset 0xA78F 9676 bytes