Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff810a517a451269…

MALICIOUS

PDF

78.9 KB Created: 2021-02-27 22:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7a8790519a0d987d09072f2c8f7f0c8a SHA-1: 5fb0db5bd073e7b09b847de68f3686c0f1060d7c SHA-256: ff810a517a451269320ff428f85e02596974488c5822976c484bd2b6608ebd6b
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://dafemum.ru/strik?utm_term=how+to+hack+inquisitormaster'. Additionally, it exhibits characteristics of a PDF link farm, embedding a large number of external links, many of which point to benign-looking documents but are likely part of a broader malicious campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://dafemum.ru/strik?utm_term=how+to+hack+inquisitormaster In PDF document text
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/wonogor-wefuro.pdfIn PDF document text
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/tovifobosujexagunej.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/jujevuxenodimom.pdfIn PDF document text
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/7a9a9.pdfIn PDF document text
    • http://taxavifixe.22web.org/water_by_the_spoonful_play.pdfIn PDF document text
    • https://teraxamexad.weebly.com/uploads/1/3/1/3/131380600/1241d303101829.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/jojitagifuva/lejutalevudiw.pdfIn PDF document text
    • http://jibaberumakome.rf.gd/handbook_of_avian_anatomy.pdfIn PDF document text
    • http://sapifux.epizy.com/rational_numbers_class_8.pdfIn PDF document text
    • http://refowokewip.rf.gd/duvesetibesuvir.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/sewanogavunexarenemami.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/dragonscale_leatherworking_guide_classic.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/streamlined_energy_and_carbon_reporting_regulations_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/rules_for_assigning_oxidation_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/rimworld_ice_sheet_1._0.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/passport_checking_information.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/79300707527.pdfIn PDF document text
    • http://waroxudon.epizy.com/hp_officejet_pro_8500_a909a_wireless_setup.pdfIn PDF document text
    • http://kenamumiv.rf.gd/aylward_academy_sixth_form_courses.pdfIn PDF document text
    • http://ririgigiwabub.epizy.com/42944119640.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_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 5248 bytes
SHA-256: 4afad6e12ea1f67fa6ec9e3338aa68642e865d6e07bcdbde1b7c49f95f8a2483
font_01_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 10708 bytes
SHA-256: 29e427d75dba32066f99fb3bdc3e13c0145cd69816489ba5b79d84905d6a793c

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