Malicious PDF — malware analysis report

Static analysis result for SHA-256 492bb75c1d6bc9e9…

MALICIOUS

PDF

74.2 KB Created: 2021-01-20 09:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 40824455ad7dc87eae5678a086876da0 SHA-1: de449646cc3ba3a3ac6b6fd657c3090d6b10d701 SHA-256: 492bb75c1d6bc9e9ac905a91cb26e446692a80571baea8b1fbd441281ec817fb
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://baarspo.ru/wb?keyword=the%20full%209%20month%20of%20pregnancy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418166/normal_5fa4fe8c5c468.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418786/normal_5ffe8f03c8cc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411702/normal_60052f7e5ae92.pdfIn PDF document text
    • https://site-1172709.mozfiles.com/files/1172709/91282037364.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420235/normal_6000002bc2541.pdfIn PDF document text
    • https://site-1168441.mozfiles.com/files/1168441/53572057015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406170/normal_5fdeb07ee17aa.pdfIn PDF document text
    • https://gesuveta.weebly.com/uploads/1/3/2/6/132680901/dififun_nokemap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fc1e4be2fb1d.pdfIn PDF document text
    • https://site-1177931.mozfiles.com/files/1177931/download_personal_stickers_for_whatsapp_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f89dc51c1baf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5f9c6678164df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_5fb97af5356b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5fc224c7a00df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zifasodokid.epizy.com/apega_competency_based_assessment_guide.pdfIn PDF document text
    • http://jalovunenenema.epizy.com/51104014557.pdfIn PDF document text
    • http://rigitusavogu.epizy.com/oracle_apex_default_date_format.pdfIn PDF document text
    • http://zasidad.epizy.com/nsou_bdp_assignment_front_page.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_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 5456 bytes
SHA-256: 3700354ea5717ee92897ae2e091fd58e36dee567d42c9b4dc83dcfb2470990a7
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 10224 bytes
SHA-256: 811c7c70cc8b50148e94d135038d5f72101a61ef9ced44a5b2e7a153c812b1a5