Malicious PDF — malware analysis report

Static analysis result for SHA-256 185ab14c4737bc29…

MALICIOUS

PDF

74.4 KB Created: 2021-03-15 14:18:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 90f598eec78d517c35d0b2557d80f28b SHA-1: 0b95c6aeed8f11b9933c294ec2791e83f961024d SHA-256: 185ab14c4737bc29a990012bfed5d462027fa86a4b403cbcf8de10a2242909f1
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, directing users to numerous external URLs, one of which is explicitly listed as a potential phishing attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content that can be leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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.
  • 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://druttle.ru/award?keyword=elementary+anecdotes+in+american+english+pdf+download PDF link annotation
    • https://cdn.sqhk.co/juduxijumijo/ageaiei/doxawaligoxize.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/dgiidHr/93471001788.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/6P7pMoI/bekabal.pdfIn PDF document text
    • http://my-favshope.online/64657818448kgddl.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/4c8b832.pdfIn PDF document text
    • https://kafomepavazepa.weebly.com/uploads/1/3/1/4/131409794/ce9a3d6b34de9.pdfIn PDF document text
    • https://pusenosegunilo.weebly.com/uploads/1/3/4/7/134705238/panexatazituw-motir-musat-vedatawofufuwo.pdfIn PDF document text
    • http://storeplus.pro/puissance_moteur_lombardini_im_350hp9x9.pdfIn PDF document text
    • http://fbcopyright-center.com/wubaridp4zid.pdfIn PDF document text
    • http://ersoil.fun/isotope_notation_worksheet_2_answerssi6bg.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/gclahfp/neon_blue_running_shoes_nike.pdfIn PDF document text
    • https://zefisuket.weebly.com/uploads/1/3/4/8/134868467/metekofavixuzeta.pdfIn PDF document text
    • https://kezozebajex.weebly.com/uploads/1/3/4/2/134265808/fijuzarilojenoko.pdfIn PDF document text
    • http://outputqwvk.space/44220719611yof8j.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
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_4aa17d9185dd4a6f88ec178c81ee6a7f.pdf?index=trueIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_91c01b4a1fdc41caaf6243180c13e00f.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_86f06a7bc95445aba6f584aa7e5a02ee.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_69dd7025371d43e8bee391f98db88b42.pdf?index=trueIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_cbeb249c21b4455d9c3b403258879f3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/fomesibanetaxogowutetimov.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_9870154690e64cb5b6b6c95e5cbd0afe.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_884f62fd211a4b9b94ad126b364b5af0.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_e894a469bc0247979ad9accbbfcbb4ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/83500568747.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/bhojpuri_holi_song_2019_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/us_army_combat_uniform_korean_war.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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 5508 bytes
SHA-256: e7d3ace59d08226366e7a93c435d6f1b29c362cddef2964a7e62eb1123fb3f44
font_01_sfnt_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 9880 bytes
SHA-256: c60987eb04f28335e7b9f76d0854a3f6aab12f8ef523ef26dfe0a37e45e02382
font_02_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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