Malicious PDF — malware analysis report

Static analysis result for SHA-256 91595abb68258451…

MALICIOUS

PDF

74.1 KB Created: 2021-02-09 11:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 62fdc9c226027ee49f0e3ba0c008dca7 SHA-1: 1ac377e9d2de4611352c3a7f47d296f63347c469 SHA-256: 91595abb68258451b7306470a154798ff8ef46514ffe3e1517df8c8871425b46
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector and a link farm. The document body, though heavily obfuscated, appears to contain text related to 'behavioural economics', likely a lure. The primary malicious URL identified is https://crophysi.ru/wb?keyword=a%20course%20in%20behavioural%20economics%20pdf, which redirects to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=a%20course%20in%20behavioural%20economics%20pdf In PDF document text
    • http://idealslimitalia-official.site/kirozozumolupudabu9l072.pdfIn PDF document text
    • https://kuwuvolabakeg.weebly.com/uploads/1/3/1/4/131407812/lizupabovim_gefegeda_wuxude.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419413/normal_5fc5f5e868adc.pdfIn PDF document text
    • http://olivamebel.com/dilamasufub2ifyb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5fd262b50d7bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_60192ab04a0ef.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/runiwuzu.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
    • https://s3.amazonaws.com/faxaxos/arena_of_evolution_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/69961459193.pdfIn PDF document text
    • http://tutunod.epizy.com/16248269944.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/vokapon.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/daoga_bodo_film_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/46416408735.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/european_society_hypertension_guidelines_2018.pdfIn PDF document text
    • http://nuxidowu.epizy.com/blueprint_2_student_book.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/azur_lane_enterprise_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/characteristics_of_personality_disorders.pdfIn PDF document text
    • http://kuxixatizoxop.epizy.com/batzal_roof_designer_3ds_max_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/95352823768.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_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 5388 bytes
SHA-256: c6a5f28c3076bb902c2ab37d91d55139ef459cd3a565fb824edc60e1af8a1eed
font_01_sfnt_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 10544 bytes
SHA-256: 69c8be319291c9f30f9f18e63f114635ac1c423e3de3b67ca2fcd685391c4a32
font_02_sfnt_off00010d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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