Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c57edb396bcc758…

MALICIOUS

PDF

86.5 KB Created: 2021-02-19 12:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b362c4001f249f5da78c35c1f52ff45e SHA-1: e03b31be90cdf240e78f3ba69e083562f72995b4 SHA-256: 5c57edb396bcc7584e960eed3feed788207fa56b26677fe5f3083ce367ce1363
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to various external domains, many of which are hosted on disposable or suspicious infrastructure. This pattern is indicative of a link farm designed to direct users to potentially malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=why+did+mrs+coulter+take+lyra In PDF document text
    • https://cdn.sqhk.co/rixutixim/jfhbbPE/photo_transfer_app_ipad_pro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418381/normal_5ff6c232e13aa.pdfIn PDF document text
    • https://wipasokewuwil.weebly.com/uploads/1/3/4/0/134000036/lumuzobaze.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/ohZogez/5262665985.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/hdK3hgo/sarifisawatew.pdfIn PDF document text
    • https://sosakenokez.weebly.com/uploads/1/3/4/4/134445245/sadedunibog.pdfIn PDF document text
    • https://cdn.sqhk.co/kamupudoro/yhexJd0/60707734577.pdfIn PDF document text
    • https://bugojexipu.weebly.com/uploads/1/3/1/3/131398417/46bdd5ec2.pdfIn PDF document text
    • https://cdn.sqhk.co/sovixojer/gegiYjc/virtual_horse_games_free_online_to_play.pdfIn PDF document text
    • https://cdn.sqhk.co/kowazodonaf/hLhhPid/89295736823.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/ihf5hjp/wind_magical_rope_hero_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/MehjbAC/54886016942.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dubexejevobogi.rf.gd/babusexun.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/cymera_editor_app.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/xitusajuf.pdfIn PDF document text
    • http://xibiwoziveva.epizy.com/jotupo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 5136 bytes
SHA-256: e1f0faaa709b62c8da54f4d1df002c5a6e4ce8423b8336955f3862936f270a95
font_01_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 10952 bytes
SHA-256: 9655e84a5954f920db95aefa1965d7e5819e405b7a89eb219942717c8a4c7974
font_02_sfnt_off00013f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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