Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd91b2b773d6124b…

MALICIOUS

PDF

72.1 KB Created: 2021-03-02 11:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 8b92b78ce5bd817a849ff189239ed4ef SHA-1: a02cda5096510f0223f271ab13cbb17f1549f507 SHA-256: bd91b2b773d6124b2d2b4c468317acc3f4cfb0f3a89164df7ec533ce46067aeb
196 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
  • 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://fokemale.ru/award?keyword=author%2527s+purpose+worksheet+4th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409630/normal_600e02dfeb06c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_603bfb5d0f45f.pdfIn PDF document text
    • http://siankaanmexico.com/bear_with_me_trophy_guidevkqw0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_603dc37106185.pdfIn PDF document text
    • http://dojaligiwojop.22web.org/literal_equations_worksheet_2_answer_key.pdfIn PDF document text
    • http://wordsidepost.top/how_to_repair_automatic_soap_dispenserz15ec.pdfIn PDF document text
    • http://tuzazigigub.iblogger.org/xusixefegeduw.pdfIn PDF document text
    • https://jefibapo.weebly.com/uploads/1/3/2/7/132712451/dowuxanobefuguje.pdfIn PDF document text
    • http://mawejufikesiruw.22web.org/padatogol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468286/normal_5fc985647b202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5ff470c37e8c0.pdfIn PDF document text
    • http://goods-amzon.com/sex_education_show_season_1_episode_3_castryzjk.pdfIn PDF document text
    • http://tisimewifexumi.iblogger.org/emulator_android_studio_untuk_amd.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/rodiligarexo/lonovukuli.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/diy_clapboard_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/vuwofevatanulukelaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/58888612645.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/ruxizapelil.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_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 5456 bytes
SHA-256: 2badeccb4cf3ab7e99d6ba43ea817fe2800a80363604eae8550b57e6ecf875dd
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10284 bytes
SHA-256: adc11b0c4f2f7de5dc7cd83afadaa459fa277ff48636d7cba1c7643c654e0df2