Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f7d837219b5f3a…

MALICIOUS

PDF

72.7 KB Created: 2021-02-14 21:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 6c5cc520aa28d643f30dfa5e04ae406b SHA-1: 70fb9201f16c1b6002cfe8e9540bb3fe05c72ba8 SHA-256: f3f7d837219b5f3a0aea3940736d225f8a320f8a96447dd8d4a271894003ceee
244 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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=redox+titration+lab+answers In PDF document text
    • http://nicechange.space/drawing_tutorial_freeysedn.pdfIn PDF document text
    • http://lestyprin.online/xununidudewafest64is.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/70333eac33fa253.pdfIn PDF document text
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/2216956.pdfIn PDF document text
    • https://gigiwejube.weebly.com/uploads/1/3/5/9/135984489/wuvotubedoderumugij.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/mod_for_minecraft_education_edition2ezz4.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/cfd30ac01ba90.pdfIn PDF document text
    • http://sandwichhq.club/joint_venture_agreement_template_nz65hm5.pdfIn PDF document text
    • https://fenuwobubejugud.weebly.com/uploads/1/3/1/4/131454420/kubexujiwogarat.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/razaxet.pdfIn PDF document text
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/35070e74fa80be2.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/bhd5MjF/fopusomojubekuwaj.pdfIn PDF document text
    • https://zabokibijeg.weebly.com/uploads/1/3/5/3/135350751/456343749.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/lovomijelun/hush_movie_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/adani_power_maharashtra_limited_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/director_authorisation_letter_format.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_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 5128 bytes
SHA-256: bf4985713c1540c38f20bd248add3e52afe9dad63b162299929af25dc9a9801a
font_01_sfnt_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 10424 bytes
SHA-256: a9c2dbea007f8ed13d9876006f37a4b177c4b79624f1ebba287b05ee04e03d62

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