Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab471f51e45d3fc0…

MALICIOUS

PDF

79.9 KB Created: 2021-03-02 22:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: aff6fa9f32a7cd657614d4f5b75d611c SHA-1: 9c63001cde72a7024c4c882229702abf821d1095 SHA-256: ab471f51e45d3fc013ca712dde8b1e24931b1c4710f96ecbdbb79ce855f23236
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the heuristic identifying it as a link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maypoin.ru/strik?utm_term=books+like+the+adoration+of+jenna+fox PDF link annotation
    • https://papazutizo.weebly.com/uploads/1/3/4/4/134467207/1245abe3714d990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_603390116e613.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/jensen_awm968_remote_codes.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/fuzozibejipoxa_mabosozewo_newovulofib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383567/normal_6006eb3fc2bab.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/talewepibiwuz.pdfIn PDF document text
    • https://tebeneka.weebly.com/uploads/1/3/0/8/130874559/wigewopakizifid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_6025cefa319b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_600c8ae544b78.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/bidQhhm/2173244123.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/python_add_authorization_header.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/gps_essentials_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465543/normal_601ee3a107abe.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/the_talented_tenth_web_dubois.pdfIn PDF document text
    • https://cdn.sqhk.co/wizevomorofe/aLjh9Tx/nurivomagedigapi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366339/normal_5fcd071e69623.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sufumawug.epizy.com/5591504149.pdfIn PDF document text
    • http://litorow.myartsonline.com/38393037345.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_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 5252 bytes
SHA-256: b7c810a6229bc5f64d60ecb794989d30ff5ceb92f70b5a085f70dd1d50b9e9e4
font_01_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 10760 bytes
SHA-256: 54d5581713fa7380a0c074f90922f9f6630505d0313c954e185319aeb8147010

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