Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b79b0b23a0d33c0…

MALICIOUS

PDF

33.2 KB Created: 2020-06-06 05:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 713da9292f7a5e8ad7586a4d54e571c3 SHA-1: 9921c85b0937fa92b35885ede7900bf01e46ce57 SHA-256: 6b79b0b23a0d33c0868eba28ce5815ba6e2b4916ff199634bc7e240f120e1a2e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are structured as a link farm. The document body, though partially corrupted, contains a URL that appears to be a lure for downloading software. The presence of numerous PDF links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful websites.

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://artducko.net/uploads/1/3/0/5/130589342/130589342.html#minecraft+0.13.0+apk+download+apkher
    • http://cloud-data-center.org/uploads/1/3/0/6/130605075/vuwupatawupa-bubev-pasejak.pdf
    • http://mail.littlecakes.nl/uploads/1/3/1/4/131437493/tilagowon-jikadopewunasu-palorololo-fapaguzawite.pdf
    • http://cambridgeelkscatering.net/uploads/1/3/0/5/130588772/porupi_xesupul.pdf
    • http://wheelzrollercentre.com/uploads/1/3/0/6/130621345/1876074.pdf
    • http://globalgirlgames.com/uploads/1/3/0/5/130540619/677962.pdf
    • http://buildingblocksdaycare4u.com/uploads/1/3/0/5/130550944/7474789.pdf
    • http://petra.cocon-interior.nl/uploads/1/3/0/7/130740019/89fd12.pdf
    • http://barkingwithbutler.com/uploads/1/3/0/3/130379094/8e3f57552605.pdf
    • http://mcculley-cuppan.com/uploads/1/3/0/7/130775968/bilulijan.pdf
    • http://artducko.net/uploads/1/3/0/5/130589342/terms.html
    • http://artducko.net/uploads/1/3/0/5/130589342/dmca.html
    • http://artducko.net/uploads/1/3/0/5/130589342/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rusevaleno.files.wordpress.com/2020/06/wutekomebuvafawege.pdf
    • https://regumawudabi.files.wordpress.com/2020/06/losajim.pdf
    • https://vigafekiwi.files.wordpress.com/2020/06/94225158931.pdf
    • https://bikewanipid755441552.files.wordpress.com/2020/06/fenefetazigiliki.pdf
    • https://lawikisuj.files.wordpress.com/2020/06/tujoliworem.pdf
    • https://lunudosur.files.wordpress.com/2020/06/menodatatemojukewuvo.pdf
    • https://gilolarezuj.files.wordpress.com/2020/06/80795107303.pdf
    • https://biwapatevav.files.wordpress.com/2020/06/maxisigusiladedunativig.pdf
    • https://zikusale.files.wordpress.com/2020/06/98555613532.pdf
    • https://pariwofa.files.wordpress.com/2020/06/gemulo.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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005684.bin
2430110c21b0969a4d3e24dc4bff1c637079d1ddfb9715ced14f637ca9a7db42
pdf-font-stream PDF embedded font (sfnt) at offset 0x5684 10520 bytes