Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd7da78bc0bfff1…

MALICIOUS

PDF

68.4 KB Created: 2020-11-09 02:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 103959cd6de12e498b309cc80c5f059a SHA-1: 4e6d1f39e2adb8a154f33faa264b4fcff9875423 SHA-256: 6bd7da78bc0bfff1712d5c0ba8684d2f14c0d7882fbb829881bc717bedc63648
136 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 https://traffset.ru/aws?keyword=laxmi+prasad+devkota PDF link annotation
    • https://rebolotor.weebly.com/uploads/1/3/4/3/134364816/7986140.pdfIn PDF document text
    • https://mazovibodekimiv.weebly.com/uploads/1/3/4/3/134398511/vakuzisodufazuxodal.pdfIn PDF document text
    • https://gawokuvaz.weebly.com/uploads/1/3/4/6/134656265/xuzafovop_nogaxevimesa_wunetetulalunot.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/lowest_common_denominator_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/62214348578.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/new_laws_of_1542_apush.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/the_garden_menu_ashfield.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/26765324406.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/a_wild_sheep_chase_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/dometic_duo_therm_quick_cool_manual.pdfIn PDF document text
    • https://jixiluzab.files.wordpress.com/2020/11/43724511552.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/zusuduzonuwadowozidopexuv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000d84d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD84D 14468 bytes
SHA-256: d3550c545c25c00e1eaf237cf9d985bbff4ca693d8e1cfabb243f5ab9a39c542
font_00_sfnt_off00008b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B99 5204 bytes
SHA-256: 2afe9627ebb30fafabe8d08a43b1b65ae936eb005d187b246c41588042ecccd2
font_01_sfnt_off00009d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3D 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000a8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A0 15496 bytes
SHA-256: e24af7f20f9a86639221601ce25d5492eaeba5ed878a9464bf92b743c1d4d61e