Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fa8a1335893223…

MALICIOUS

PDF

77.3 KB Created: 2021-01-20 05:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7b576f751e49dd406b2cf97b154d1679 SHA-1: 1302a5e10e0a4c8d3c6d902b77322db0ce374d5e SHA-256: 50fa8a1335893223294e1d361b7e959acc5dd4d678493633160bc27f41da2ded
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The ML classifier also strongly indicated maliciousness.

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.
  • 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=battle+cats+unlimited+cat+food+ios In PDF document text
    • https://kafowuvipuv.weebly.com/uploads/1/3/4/3/134337110/1702501.pdfIn PDF document text
    • https://sosijujanakuf.weebly.com/uploads/1/3/5/3/135387992/7d0e5.pdfIn PDF document text
    • https://sebumeganajili.weebly.com/uploads/1/3/0/8/130874272/perugix.pdfIn PDF document text
    • http://nususolajegak.iblogger.org/nys_defensive_driving_course_answers.pdfIn PDF document text
    • http://rebituzugofebo.22web.org/effects_of_globalization_in_education.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/vomegigawusa.pdfIn PDF document text
    • https://xekobemakisusij.weebly.com/uploads/1/3/1/4/131438823/nadeliwejuf.pdfIn PDF document text
    • https://luvisumor.weebly.com/uploads/1/3/5/3/135390586/lokiwe.pdfIn PDF document text
    • https://napuximijagebi.weebly.com/uploads/1/3/4/7/134766840/vowebesakak_buvanili.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/4086241.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/japetuv_jameras_zinapidetufutil_rajekapadajive.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/xinew.pdfIn PDF document text
    • http://kuvelopomegemes.iblogger.org/audio_visualizer_app_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwagof.rf.gd/snail_solution_hydrogel_mask_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/dugofolibegegeni.pdfIn PDF document text
    • http://xegefonupekowa.epizy.com/rudadexufivaduxosenet.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/narowo.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/tituva.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/gutozalirekigi.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/narasimha_kavacham_kannada.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_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 5120 bytes
SHA-256: 09c5cb7ab8b5ea3a2706f2a9ab8baa1974e564270f572ede9975d90a4f9a05e3
font_01_sfnt_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 11148 bytes
SHA-256: 57c4c02bb105869ed7d3004cac874fa49e9ec9dba23bdbc6c8dee24de6a8809f

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