Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa45c540ff9ae5f…

MALICIOUS

PDF

73.9 KB Created: 2021-03-30 02:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e0ee5154e2e404d78400a24d25463d8e SHA-1: fb47dadbad98d10c3675c9ff742428b4837ae04f SHA-256: faa45c540ff9ae5fe2a124f862ee42b08701bcca316c770db1b17cab75d62bf1
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF document contains a high-severity heuristic firing for a fake CAPTCHA, indicating a phishing lure. It also includes an external URI and a redirector link pointing to 'https://xajibur.ru/wix?keyword=cash+app+hack+no+human+verification+2020', which is likely a phishing site. The ML classifier strongly flags this PDF as malicious, and ClamAV confirms it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/wix?keyword=cash+app+hack+no+human+verification+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5fcc5645accca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451025/normal_5fca076407647.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413119/normal_5ffe915fbe48b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_5fd87b1c4bba2.pdfIn PDF document text
    • http://gegapaxibu.22web.org/director_job_description_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497071/normal_600f770d4d571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_600acaffd7ea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_604f35ab9cf57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_6058a65190162.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/monthly_attendance_excel_spreadsheet.pdfIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_44d66283344a44f8a3ada9c5fd90e4e5.pdf?index=trueIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_03b418b770574ad1b59ab2e616ddc573.pdf?index=trueIn PDF document text
    • http://fubegamo.epizy.com/descent_into_avernus_5e_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/26642041216.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_06ca81675370486ba08892159685e20f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/47823988777.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/6720203913.pdfIn PDF document text
    • http://dizogusuvi.rf.gd/34823672738.pdfIn PDF document text
    • https://b24036c1-08f6-4d5b-b8c9-f4c47f26e437.filesusr.com/ugd/ae9acc_92f260f227a7406ab88c9aea86e44d53.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_ae2bf2612b08477c8ebffd2ace419372.pdf?index=trueIn PDF document text
    • http://satoposip.epizy.com/livurelupasazuti.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/new_graphic_novels_august_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/articles_of_incorporation_sample_template.pdfIn PDF document text
    • http://wefebamis.rf.gd/mobile_money_in_zimbabwe.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_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 5524 bytes
SHA-256: 72536ac756f6f65ba62bbf6fcbabe10d6ffbd5551ee520d0f840cdaccb98415c
font_01_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_02_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 10832 bytes
SHA-256: bb3ce69a6621827f6760d47276af3737b18f9db421293391eefb63e295982fd5

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