Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bcce072f71289d…

MALICIOUS

PDF

86.4 KB Created: 2021-02-17 03:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 9f2abf4e0651bb5216ec5959cb0ac35e SHA-1: 3c3aa2d49232f85904581edca875f8748a25e509 SHA-256: b5bcce072f71289d7f882d44f359f95acd90517bcb82f53a715be1ec5b35be10
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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 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://yafferge.ru/wix?keyword=zombie+castaways+mod+apk+ios In PDF document text
    • https://static.s123-cdn-static.com/uploads/4460063/normal_5ff4d40a06dfc.pdfIn PDF document text
    • http://daxepekudinis.iblogger.org/cavan_biggio_scouting_report.pdfIn PDF document text
    • http://sokadap.22web.org/computer_system_class_9_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5fd2e7dc13c03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_6020ffeccbe86.pdfIn PDF document text
    • http://papopeputato.iblogger.org/fapitokef.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://xuxevimikari.rf.gd/cancionero_catolico_para_nios.pdfIn PDF document text
    • http://waxusumuguk.epizy.com/canadian_passport_application_form_child_outside_canada.pdfIn PDF document text
    • http://nivufebolira.epizy.com/tales_of_symphonia_100_guide.pdfIn PDF document text
    • http://nilikimapineti.epizy.com/karaoke_brooks_and_dunn_i_am_that_man.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/ca_form_cdtfa-_230.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/wumenodejuxukojesav.pdfIn PDF document text
    • http://tonikeb.rf.gd/avengers_believer_song_in_tamil.pdfIn PDF document text
    • http://guvewenif.epizy.com/contrapositive_proof_worksheet.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_off00010992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10992 5128 bytes
SHA-256: 7604e981ac7053d2dd0d98cea36b4097deecc0a87f5fa1cebb6e741085d7591a
font_01_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 10348 bytes
SHA-256: 133ad125a3378639803928c8eb1ff746ce40202fca8f7348588b88e8d4e78124
font_02_sfnt_off00013e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E87 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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