Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f50f50b5179073…

MALICIOUS

PDF

92.0 KB Created: 2021-02-19 04:15:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 6a79eae20575d2a0ce06f4a33cb5eb3f SHA-1: 4c5219d5a1e668cac6c398e877ab68b5d25a2c34 SHA-256: a3f50f50b51790731c8fefd2e8782230fb303b83bf507f0a9300e1469cfcee6a
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wb?keyword=is%20today%20all%20saints%20or%20all%20souls%20day PDF link annotation
    • https://cdn.sqhk.co/gizetinediz/gZhjgij/jepaboja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_5fd1036fc45c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5feb2b6e020c3.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/VwWjcic/jiwanux.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/ggRIZN6/91373929539.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412599/normal_5fffee129ba01.pdfIn PDF document text
    • https://cdn.sqhk.co/wobivada/mthghiD/88148540970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455197/normal_5fe3365b59fa7.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/ijiib5b/pencil_box_clipart.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/1nk5Hje/tedipabetuvire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_602ef51f81d98.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/belamu.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/JgjGhaL/california_shelter_in_place_date_los_angeles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/3d_model_cars.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/crowd_walking_sound_effect_free.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD0 4860 bytes
SHA-256: 6b6f868c6e76d3c3995ca9dc13efbe1febacad454636fd2477cc29d57938d72a
font_01_sfnt_off00013b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B68 12176 bytes
SHA-256: f921ef7a686311e898b9727977e854fc046afc9dcb926c4fef440a86669ff1af