Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad83a1bda003d1cd…

MALICIOUS

PDF

90.1 KB Created: 2021-03-21 01:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 73bde974b16f9e48d5d7c32af0341dd6 SHA-1: abadbb9d88bd0753c42568106f7538f6e6195d0d SHA-256: ad83a1bda003d1cd761f22139d43a29caf2e30aa30401dff47e2a5c7a097d9ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' specifically identifying a mass of external PDF links. The primary URL points to a keyword-based search on a suspicious domain, and the first linked PDF is also hosted on a suspicious domain, suggesting a link farm designed to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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
  • 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.
  • 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/wix?keyword=ti+84+plus+c+silver+edition+instruction+manual PDF link annotation
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/lafakejulejajewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475992/normal_602892734c5da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384030/normal_5feca00f53904.pdfIn PDF document text
    • https://juvifopabolosat.weebly.com/uploads/1/3/5/3/135313118/f89ae7e.pdfIn PDF document text
    • https://vesilaxevi.weebly.com/uploads/1/3/4/7/134735958/vebup.pdfIn PDF document text
    • https://biwewonopegad.weebly.com/uploads/1/3/1/3/131380063/4d15cd66e66b9.pdfIn PDF document text
    • https://rebadezoj.weebly.com/uploads/1/3/6/0/136027304/vawumuvodubu-rerunupekosowux-libofobopafiv-tuwasefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_602180aaa250c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_603ba583e136b.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/25823134885.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/ruvifaniwegodiko.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/34394360235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3f4a2f4-ef3d-4735-b4cf-1b0a3fb810df/the_alienist_season_3_netflix_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/xajasajimuvipegemupakoj.pdfIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_65fc7e2c55874fea868a9b85084100f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetevali/o_capital_editora_boitempo.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/jogos_para_pc_fraco_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25c37bb-6621-4133-9271-10feab8b8864/49807905491.pdfIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_0fe9c13280434686beb54cf901c8d090.pdf?index=trueIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_3052887e24e3435b935b16f4f3d8c4e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/boom_beach_hack_diamonds_android.pdfIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_6013f88c319940eabfd364fa6da753a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe520fbf-152d-4d68-a634-35a4a64d3097/97508868289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5e9127-f9d5-4cec-96ab-f197a4fe8c15/jitterbug_perfume_beet_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b306aa4-5f9c-43b2-b855-e85edd69a617/what_is_a_level_5_leadership.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/registered_dietitian_exam_study_guide.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_759125a6c092432ebae4ca6d7fa78a93.pdf?index=trueIn 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_off00011482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 2008 bytes
SHA-256: 573820f04c6e6c1415dee607315e3fb5a62908d427ebca8f9936ffb6b365a16d
font_01_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 5508 bytes
SHA-256: 1f41a25ee0793a3c3afe7bc6fc321827b28828ea45aa41f9c45525277e8a17f3
font_02_sfnt_off00013099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13099 12156 bytes
SHA-256: f1725d57cce04130ba549410d2803f93312519fb4e0acc9af21b9769b10122ec

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