Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a8b67fd1761aa9…

MALICIOUS

PDF

71.2 KB Created: 2020-11-20 02:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: dd0b0aab98e4035c9d003c6aebd18071 SHA-1: 3d9c231afe73b30609affc2423a8a4c94906153f SHA-256: 92a8b67fd1761aa95e380069b7ebe0d4c8c5baeb0ce9c4546c1ddac8b33dccbc
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=bidirectional+visitor+counter+using+arduino+pdf In PDF document text
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/visokumevu.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/910391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_5fa84d9e3da4a.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/tewipuwuxesunel_zixijafe_wojopifidop_maxeko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5f93953d2dfb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f8707148b3a1.pdfIn PDF document text
    • https://masarifixi.weebly.com/uploads/1/3/4/4/134486171/zixituzipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_5f946ba141265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_5fa996b767e47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1327b4ac-bf5a-427f-aa6a-222a9d183d01/daniel_boone_high_school_johnson_city_tn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c7d6af-f4d1-47a4-85e7-5b51d3815fc8/legizine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ebada5-4184-423f-a47f-ae91a0c9df76/zanemosonojaxobokepefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b32c9e92-cf71-489d-996a-e1b67347a90d/micropaleontology_foraminifera.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CA 5312 bytes
SHA-256: cf022cf0e7b7d70cbc7aba889f86a46aaf0fd918913ed1f69ada747ad5e94371
font_01_sfnt_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 12000 bytes
SHA-256: 4e5cb258dbe83c82f368dca05070f6c23c0d9f87ebb9d2a946816c28ef7853fe
font_02_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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