Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b137339e7e9913d…

MALICIOUS

PDF

72.0 KB Created: 2021-02-19 05:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d8a6a8c830f127da83129ebcd482a375 SHA-1: f413050e1ea5d06891a45dff5e1fe25c179565f1 SHA-256: 4b137339e7e9913db5041d541e452971812a2ebfb60eda0f57a4898b16653575
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links to known malicious redirectors and disposable hosting sites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly suggest malicious intent. The presence of a password-protected archive lure further supports the hypothesis that this document is designed to trick users into downloading a malicious payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=toomics+free+vip+account In PDF document text
    • http://akb54.ru/what_are_newtons_3_laws_in_simple_termsdwf7s.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/nesijoruvedunesogorruph0.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/iajehbf/cookie_clicker_2_hack_iphone.pdfIn PDF document text
    • http://healsmall.space/80416918694jbhdw.pdfIn PDF document text
    • http://formblckr1.xyz/barbie_christmas_carol_dolls5a15.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/hiuhbhh/93673283089.pdfIn PDF document text
    • http://fruits-summer.fun/kesewijiganafu4z0.pdfIn PDF document text
    • http://usene.xyz/wesulawubidoviqa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_6020fda4ecba2.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/pihjhxS/21st_birthday_party_themes_for_her.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_600a1b96da82f.pdfIn PDF document text
    • http://falenubodopo.22web.org/46174993098.pdfIn PDF document text
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/f1181e663332.pdfIn PDF document text
    • http://findssldz.xyz/english_speaking_learning_app_freeqny2w.pdfIn PDF document text
    • http://appeal-ig.com/office_365_user_instructionscpp5q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jolenifetonami.epizy.com/ap_polycet_2018_question_paper.pdfIn PDF document text
    • http://gobipubefosoja.epizy.com/despacito_lyrics_in_spanish_song.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_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 5140 bytes
SHA-256: 851040ba9279efd65ff9c4f068fc1c52493e7eaa078af706b425925d9768dbc9
font_01_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 14352 bytes
SHA-256: 4c437f7808992756fb4e26c18cfe904a7afb910e74efa9c023aaa6b19a478a16

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