Malicious PDF — malware analysis report

Static analysis result for SHA-256 10809d4ef1af9cfa…

MALICIOUS

PDF

72.3 KB Created: 2021-06-10 07:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 36f1fd0b3616a3cf4871b9bb89a3e378 SHA-1: 96c5bf7001fbf8a04348adeeccfb49482d21a261 SHA-256: 10809d4ef1af9cfa76c5152dbaf87fee5364e91c9b3b661fe90fdd8cb21b185c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/pbw?utm_term=general+reading+practice+test+1 PDF link annotation
    • https://mewifebobonopad.weebly.com/uploads/1/3/4/6/134625165/4761673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485305/normal_5fd6df58d1f22.pdfIn PDF document text
    • https://birafuwufejutik.weebly.com/uploads/1/3/4/5/134598964/5177235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471691/normal_5fe9d5a4c8be8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_604b725264719.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d21c10-c7b1-4856-82c3-e06b436795ed/51342454267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd15befe-dcf2-4158-9798-328298dd3f7d/who_has_the_best_deals_on_dyson_vacuums.pdfIn PDF document text
    • http://pusavivo.pbworks.com/f/clash_of_clans_th8_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e6d7f00-7b15-4b3f-a6fd-c550177c5dfd/associated_press_style_state_abbreviations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16785f33-aa09-46c1-9a77-3569c7fdce54/zafovutadezox.pdfIn PDF document text
    • http://mawasuwov.pbworks.com/f/jexemabijawigipafobudewan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1001b3a8-e347-4876-a9cf-19b29202a178/74827490933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f80972bc-bf59-4e83-8256-bc31902746df/nolelejewivew.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144439167/56893293684.pdfIn PDF document text
    • http://nadupodifado.pbworks.com/f/how_to_restart_dexcom_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d9ce8d-f0f1-44c8-80cb-585230bb726f/konazawudovefusunofiregu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fab8079-4915-4cb0-b426-ef62f22fff54/29105151815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1553e9b8-8242-44da-bc80-2d86d78a5bb2/how_to_reset_oil_change_indicator_on_2017_jeep_grand_cherokee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/048f725f-63d3-4522-b06a-1553d57101fe/successful_time_management_for_dummies_free_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 5324 bytes
SHA-256: 44a0c8a769c141dadf2bf98a27e6fdd7a9a84884cb468f92dd2193c4dc75d853
font_01_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 10792 bytes
SHA-256: 9f9d2a4375351165415d2c188970ba40d82f2f774158be37752cddc6744e7344

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