Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae7f82fb773b7dd…

MALICIOUS

PDF

72.9 KB Created: 2021-02-15 12:29:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1528048abd154b71a68aab568889c862 SHA-1: fae3626968e3c23bdfe690d31918eaed5601def0 SHA-256: eae7f82fb773b7dd5192d7431008b5d5e92fb8f3c9d357225ec2ccf591a4ea15
214 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Relion humidifier instructions'. The presence of numerous PDF links indicates an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/wb?keyword=relion%20humidifier%20instructions In PDF document text
    • http://masuxuxu.iblogger.org/ragabilagadimuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_600fdea530de5.pdfIn PDF document text
    • https://kawijidaxo.weebly.com/uploads/1/3/4/8/134891868/4504835.pdfIn PDF document text
    • http://guwelureg.22web.org/ave_maria_malayalam_devotional_songs.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/buvuke.pdfIn PDF document text
    • https://dixawofira.weebly.com/uploads/1/3/5/3/135303501/redefop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5fdfb8b39d79a.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://dususadaz.epizy.com/fegowarajupuj.pdfIn PDF document text
    • http://kezakixekinefa.rf.gd/hindawi_publishing_corporation_case_reports_in_dentistry.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/nims_700_test_questions_and_answers.pdfIn PDF document text
    • http://segudufarus.epizy.com/17496551298.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/zufexupawozizufekozapof.pdfIn PDF document text
    • http://mosawamowote.epizy.com/21051669106.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/306401158.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/gram_positive_cocci_bacteremia_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/96698745966.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/36862579208.pdfIn PDF document text
    • http://sefenepisepaje.rf.gd/99303131133.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/types_of_social_workers.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/it_security_risk_register_template.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_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 4940 bytes
SHA-256: 16e0dc192d3fcb0a53124a51cd11b2c3c02571953f6dd83f3b760106ef44d553
font_01_sfnt_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 10084 bytes
SHA-256: 4e6dd791d20adc07969f5a161f2c6644b7e1ebb07451344e7b7266bf2fc3a2be
font_02_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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