Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b73775abcff736…

MALICIOUS

PDF

70.4 KB Created: 2021-02-20 01:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 3864382ceecd6329a0e84426407fca4b SHA-1: 652fd903ab88143e9241fce0e10713b25abc8d56 SHA-256: e2b73775abcff73602653ecfe392929baa971110122d0175dff9c049929c3ccf
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://crophysi.ru/wix?keyword=bio+peer+tutoring+uci In PDF document text
    • https://static.s123-cdn-static.com/uploads/4456134/normal_5feeafb927084.pdfIn PDF document text
    • https://fagudigozupubu.weebly.com/uploads/1/3/6/0/136042622/jobir-gopajur-tibupafu-kenumiwebam.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/200851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_5fd24fb960015.pdfIn PDF document text
    • https://wizujepubenepax.weebly.com/uploads/1/3/5/3/135317151/jikijud-nojokogeva.pdfIn PDF document text
    • http://kotigowaxed.iblogger.org/neopost_in-300_psd_locked.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/xapini-nuduxipom-lelapuresew.pdfIn PDF document text
    • http://zelijek.iblogger.org/bewiridawomutadud.pdfIn PDF document text
    • https://magirakikepemun.weebly.com/uploads/1/3/4/0/134000039/melidudepu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wawavubuwile.rf.gd/avatar_telugu_movie_2009.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/77517808244.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/fnma_guidelines_for_short_term_disability.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/tapalemobudixipojotuzokix.pdfIn PDF document text
    • http://kutoduno.rf.gd/weather_report_hyderabad_this_month.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/tuzukemomaguvetewajolove.pdfIn PDF document text
    • http://mewarur.rf.gd/75325873794.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_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 4732 bytes
SHA-256: 3c9365c8343b5f615885f63f85b1cdb68a9369cfd85a131a836853b080d9d91c
font_01_sfnt_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 10812 bytes
SHA-256: fbf0d52aa3fd1856ee3bd7617335190d568a5b84e8075ea47e88ff64fde59d82

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