Malicious PDF — malware analysis report

Static analysis result for SHA-256 164fd41206039349…

MALICIOUS

PDF

66.8 KB Created: 2021-02-01 23:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: bc998a239f8b5257730e7f68ba17e930 SHA-1: 4d1b76f9bb3ce3307b0894dc3b995dba5adba422 SHA-256: 164fd412060393499267a34e9e2fb2667007c699c50d339b9bcd599adf1fda5d
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/123?utm_term=plant+hormones+and+tropisms+worksheet PDF link annotation
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/2616954.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/ggAgeZd/18767739297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_5fe7085f2fe78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_6002107f68025.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/mefovu/tobukivegawi.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/sunemajebokigef.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/jugupaguxado.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/4688092685.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/los_cascabeles_magicos.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/74155006491.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/kumata.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/69104758301.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/kulofojudusowot.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/upland_primary_school_bexleyheath_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/zimidubokor.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_off0000ca1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1B 5356 bytes
SHA-256: 272b941f080c6f6ddc6e3e4d63c865883eb6e7a3f7262de135213a97ad479dec
font_01_sfnt_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 9960 bytes
SHA-256: b587c4b56acea942fd420147f048f03c9bed635492cfaec55ab1626470aee83d