Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1beab14ef6bb6e…

MALICIOUS

PDF

92.7 KB Created: 2021-04-21 23:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05eb98cb62d6ac91b37eafdade9ce0fb SHA-1: 7fb5c6a7d84f4fead3a30d8909bec0d726d877fc SHA-256: 9c1beab14ef6bb6e56f3334a271199f0526a6e88adde72648fbaaa012f82e9dc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=words+of+encouragement+for+new+moms
    • https://cdn.sqhk.co/bepifopid/ggZns9B/nepimusoxixoniwisinixegi.pdf
    • https://cdn.sqhk.co/tejikeluz/jejcGRv/nujapoguxibexabej.pdf
    • https://cdn.sqhk.co/buganisazobu/Kdiahf1/avernum_2_crystal_souls_android.pdf
    • https://cdn.sqhk.co/tikugosedik/hhbihxL/dafudukenigagufuwok.pdf
    • https://cdn.sqhk.co/nufesewepi/lhgkijC/kovalagobivevejaburomemu.pdf
    • http://munoleriba.iblogger.org/renizulivaxodagivasite.pdf
    • http://kabepuvilu.iblogger.org/calendula_officinalis.pdf
    • https://cdn.sqhk.co/wepugozotap/hhgcAia/javukoper.pdf
    • https://cdn.sqhk.co/ketegobuto/4gegggd/zegoboxonijujimosil.pdf
    • https://cdn.sqhk.co/figegixo/f8gxTkB/fishdom_mini_games.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bfb25b5c-7f45-48b1-bafd-5dd9cc73dadd/37230015557.pdf
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_637f54b7ac0c4d209545642d857b0b80.pdf?index=true
    • https://s3.amazonaws.com/gidibesuxi/wujedidu.pdf
    • https://uploads.strikinglycdn.com/files/fb0e05a8-9d38-487b-9f74-e9ec7cecc132/how_to_get_new_business_loan_from_sbi.pdf
    • https://s3.amazonaws.com/lusegokaves/60610505741.pdf
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_9ec3f262088b4a35a08a417de8850fca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f3f9c997-3ab8-4fbe-9391-f558fdf90596/which_water_heater_is_best_in_india.pdf
    • http://rugeritubaduw.epizy.com/competitor_analysis_example.pdf
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_cdec3fa34f904051ac39caa24e2fe5f2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bd0e36c5-1315-4370-b370-367116fc940a/virabodutimuduwababek.pdf
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_a362093ab61a423abae1de6791260dd3.pdf?index=true
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_13c02d41e6214835b3612b8406648101.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6d131210-6cd9-4c34-96d8-df81ba075877/the_boy_in_striped_pajamas_book_cover.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120ea.bin
60ec6ac75c04046aa3fd2657bd402a3b270ef17185636bbdf7af6d1bd27bf310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 5248 bytes
font_01_sfnt_off000132ba.bin
0f6c0a0955c82c6d92566d6a09332e969b921ae7d547d2ac74d7aa46631531fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132BA 10700 bytes
font_02_sfnt_off00015720.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15720 4324 bytes

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