Malicious PDF — malware analysis report

Static analysis result for SHA-256 7907ca5279deb847…

MALICIOUS

PDF

86.0 KB Created: 2021-04-06 02:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 097021a25d7779ebf044bfe3b774284c SHA-1: 3c36ff6c49ea0a2da8e5c9036b6cdc75a2b972f5 SHA-256: 7907ca5279deb847288b2e636ccc7e370e05c8738bc68bdd6912e0197271405d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, suggests a lure related to 'Bible quiz questions', likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/award?keyword=bible+quiz+questions+and+answers+from+luke+pdf+in+tamil In PDF document text
    • https://cdn.sqhk.co/ravuviwidi/ArqX7jg/87172978665.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/Yid4jhg/91871903628.pdfIn PDF document text
    • http://gagerovovus.22web.org/chambre_des_metiers_nimes_formation.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokoze/WgjaChf/44900568597.pdfIn PDF document text
    • https://cdn.sqhk.co/joxutedunik/chdOmhi/78976870458.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/j7jhbhf/hidden_agenda_definition_and_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/MjhUP5U/paxovizaro.pdfIn PDF document text
    • http://zapapoberok.iblogger.org/central_and_peripheral_nervous_system_lesions.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/OidheJe/54500585698.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/gdugfjc/94701070045.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/iiiWjiS/reading_comprehension_worksheets_5th_grade_common_core.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/hajihil/44528126605.pdfIn PDF document text
    • https://cdn.sqhk.co/ninoporaleva/eTifmji/kejagipilufur.pdfIn PDF document text
    • http://zijojot.22web.org/play_the_queen_s_gambit_chris_ward.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/kotlin_guidelines_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c5d6b0-a30d-4e38-95b1-9169a76352ad/jobixeralezimulanunozip.pdfIn PDF document text
    • http://bovumemudij.rf.gd/87946666142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0800fbd4-e54b-45e4-b775-b5211ced9d0d/segunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae35506-86a8-40d0-be89-5fc4a089a058/54112168348.pdfIn PDF document text
    • http://gawoloresi.rf.gd/26734204060.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/61748926692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba068e6f-c43d-4ae0-a5f9-a5d2108d11fa/flip_video_camera_battery_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be303032-a721-48c6-895c-95b5b9e157fb/topowixesexixujukusak.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 5708 bytes
SHA-256: 4964c4c59670eb43c3445f8b26967457bde484afe3e78c714167be96e091216c
font_01_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 3772 bytes
SHA-256: 753412eea5910afeb1d939f83890ebb22a2859cf8a550dcaf3c3f8ae184d633e
font_02_sfnt_off00010d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 11488 bytes
SHA-256: b357849bc17b259384fdc5e7c9ec81915be870c8281ba720627958f6a6c637c6
font_03_sfnt_off000134a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A9 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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