Malicious PDF — malware analysis report

Static analysis result for SHA-256 770f39f582f6c428…

MALICIOUS

PDF

63.3 KB Created: 2020-03-23 14:08:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7b39759a079692cc71c271b9649e69e5 SHA-1: 58b1649e4d7372aeb43cecf1127aec06bd1d0a65 SHA-256: 770f39f582f6c4289f4276b2bfe69f3e9d55d9c80391ef6e43122e12612db7df
96 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts a large number of external links to other PDF files across various domains. The document body also contains embedded URLs pointing to these external resources. This suggests the primary purpose is to redirect users to a network of linked documents, potentially for SEO manipulation or to serve as a distribution point for further malicious 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://yogalifesf.com/uploads/1/3/0/8/130874431/130874431.html#la+letra+a+minuscula
    • http://extremeautoservice.us/uploads/1/3/0/3/130323697/dawutalasutimino.pdf
    • http://www.brilliantlyyou.net/uploads/1/3/0/6/130604538/bfc231f.pdf
    • http://innovativebusinessstrategies.org/uploads/1/3/0/2/130289630/mebazutiwurele-lidigirukiseve-boditoxoximafid-vinul.pdf
    • http://autodiscover.mikepaganrealty.com/uploads/1/3/1/0/131069992/kovisokoza-rinawipaburi-loxujowinunod-xulizojap.pdf
    • http://doverorchestra.com/uploads/1/3/0/3/130313022/tavatirasigu.pdf
    • http://kids.ladse.org/uploads/1/3/0/7/130739793/poradozixufavodubaxe.pdf
    • http://thedesignguy.ca/uploads/1/3/0/5/130543980/6702491.pdf
    • http://johnrandall.org/uploads/1/3/0/5/130546519/bb631b68c54ba2.pdf
    • http://walkaboutfarmfurniture.com/uploads/1/3/0/6/130620677/nudogo_rakipupipafoduv_bopafifuk_dipeb.pdf
    • http://bangladeshinvestmentbd.com/uploads/1/3/0/6/130639837/2536053.pdf
    • http://mexonthemenu.com/uploads/1/3/0/3/130313748/wuduwaxefe_mijebirowatuw_xezasujobowisix_fuzob.pdf
    • http://naileditnorthshore.com/uploads/1/3/0/6/130639729/nijenaf_resesosefire_lofulefe_jopiraworabisa.pdf
    • http://montealegrefarm.com/uploads/1/3/0/6/130639333/7724963.pdf
    • http://elunconsultoria.com/uploads/1/3/0/7/130775651/6233235.pdf
    • http://www.blueoceanapparel.org/uploads/1/3/0/6/130620470/ninelumav_kavixemi_vukiwupuxif_mewabigaz.pdf
    • http://www.gabriellathomasfinalportfolio.com/uploads/1/3/0/7/130739933/walipamejogavoxanoz.pdf
    • http://seikbeats.com/uploads/1/3/0/5/130550834/xorune.pdf
    • http://middlesexrheum.com/uploads/1/3/0/7/130776823/d030d6f3b823133.pdf
    • http://cynthiavalero.com/uploads/1/3/0/5/130538988/kiluxes.pdf
    • http://www.mobilhomebluesky.com/uploads/1/3/0/3/130313054/3b0e077f.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://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000864f.bin
14f4ec7711784ccb807bfd39f0c51dfd0a48ff93cbea3cca96fd108669e49ca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864F 6956 bytes
font_01_sfnt_off000097c0.bin
6e63adf18c9737a94aa503b2e8734b476ea9e5f9a23991be6df017a74f84f013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97C0 10948 bytes
font_02_sfnt_off0000bcfc.bin
97f3dfd01035a3822ca95ad381a6e8414e75f7fcb668505be6f67f3cf050fee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFC 3056 bytes
font_03_sfnt_off0000c7bf.bin
e6c247e197353bb748d1b0320f3ddd174f29758bcf9774166904267a5d21915c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BF 16220 bytes
font_04_sfnt_off0000dd20.bin
ef3ab7a877e753efcbabebec5b0237cd92537d8aa438d267b88755b5eb4165b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 6188 bytes

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