Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f17f45382628a2…

MALICIOUS

PDF

95.1 KB Created: 2021-04-09 03:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27e25c5a6e90889b91a175c6063e618f SHA-1: d7065942290f2138f9540248eea1185eebe06340 SHA-256: d5f17f45382628a2dc90760c959aa599b024cae86cd4e05080819f310164d199
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 point to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. The embedded URL and the heuristic firings suggest the document is designed to redirect users to external sites, possibly for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=how+do+i+improve+my+intuition
    • https://tumurotijom.weebly.com/uploads/1/3/4/5/134512141/mezixegovaxopet_visozed_zanesifapat_zuromogabule.pdf
    • https://mewopufi.weebly.com/uploads/1/3/4/2/134265659/1e3e4c90b34.pdf
    • https://cdn-cms.f-static.net/uploads/4389353/normal_602561e429776.pdf
    • https://static.s123-cdn-static.com/uploads/4412170/normal_5ff3a8079acaa.pdf
    • https://fafixujanubaza.weebly.com/uploads/1/3/4/0/134096145/zosit.pdf
    • https://cdn-cms.f-static.net/uploads/4476580/normal_5fe816896aa39.pdf
    • https://xenexaguvu.weebly.com/uploads/1/3/4/2/134265948/aa6c2b.pdf
    • http://topesiz.22web.org/easy_geometry_worksheets_free.pdf
    • https://rogaturo.weebly.com/uploads/1/3/1/0/131069781/8494758.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bexopikirekide.rf.gd/72463862901.pdf
    • https://s3.amazonaws.com/jotizifime/aviation_cocktail_diffordsguide.pdf
    • https://uploads.strikinglycdn.com/files/6cc44774-0b0e-4e37-8338-579786d3e8a8/8033278526.pdf
    • https://s3.amazonaws.com/bewibiwat/baxiwexazumu.pdf
    • https://uploads.strikinglycdn.com/files/f7874374-6ebb-4b50-b807-ea4a7e57d2bd/gaseguxigozudav.pdf
    • https://s3.amazonaws.com/jotizifime/36297250361.pdf
    • https://uploads.strikinglycdn.com/files/33f24cb3-566e-4668-b7f7-432d3cb0772e/how_to_enable_dolby_atmos_on_onkyo_tx-nr636.pdf
    • https://uploads.strikinglycdn.com/files/364c0c63-8611-41fa-995d-ac7deb3c3cda/old_school_runescape_trailblazer_league_hiscores.pdf
    • http://fazafof.rf.gd/luzin.pdf
    • http://zaxalamel.rf.gd/exponents_rules_cheat_sheet.pdf
    • https://uploads.strikinglycdn.com/files/087df31f-c7b2-43b4-9224-ccc587a487a8/58141467613.pdf
    • https://uploads.strikinglycdn.com/files/b40ea48d-3b0d-4081-bdcb-f7fdde1c7d02/gelonawebuzoxewexadufu.pdf
    • https://uploads.strikinglycdn.com/files/07a946a4-b531-4ea5-9b61-fd871e1bebec/motorola_talkabout_t600_headset.pdf
    • http://diwifesatikebak.epizy.com/fisufiwibutu.pdf
    • https://uploads.strikinglycdn.com/files/bebd0ecd-be99-4262-9215-0400c2f343ad/51792247527.pdf
    • https://uploads.strikinglycdn.com/files/e1a98050-197e-4809-a1cc-61392d8f1ce1/rainbow_fish_coloring_page.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001374e.bin
d8d22d22e84a938c58e828634c25d14b1d84705baa08dbdc1a811e5698d4ec43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1374E 4900 bytes
font_01_sfnt_off000147fa.bin
03d8851e71f221753a95ff5a8f32dddd2dd17ddbfaaed23c83188d55f2d7d859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147FA 11488 bytes

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