Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f744feb3f61234…

MALICIOUS

PDF

73.5 KB Created: 2021-03-18 09:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a84839d717d56bb6a9db4d731808beb9 SHA-1: 5dd80669b87d620e3cbcc079cdc3042ce56bbe8f SHA-256: f8f744feb3f61234ebe135510578aab88166182751c5ae9af47f93ca01c8a643
186 Risk Score

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 0.9952

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://dugedepap.ru/wix?keyword=subliminal+leonard+mlodinow+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fe5807952d80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_6050e35824b6c.pdfIn PDF document text
    • https://kunexiravirub.weebly.com/uploads/1/3/5/3/135344507/3519787.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/tinufefatexaga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407081/normal_5ff0162d3a2dd.pdfIn PDF document text
    • https://koxawobe.weebly.com/uploads/1/3/4/5/134528326/givimafagabet_vepafiborogita.pdfIn PDF document text
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/6402330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467306/normal_60282240d72be.pdfIn PDF document text
    • https://pasuzexogisinib.weebly.com/uploads/1/3/4/2/134266431/bezujatalejuwu-nozajabad-lavoji-daxuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_f2019a47d6614b43b368c5952412332f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/707aa27d-9820-45b7-ac84-df86eb3a0312/how_do_you_balance_work_study_and_personal_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6126c3-d336-4044-a9ea-87ca9a515aa3/nortel_m3904_quick_reference_guide.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_ff32017b86014732a21423da52994b6d.pdf?index=trueIn PDF document text
    • https://d64d5b41-a66a-4b78-b87f-0feaf8e9cf76.filesusr.com/ugd/cf1aed_8989abf7adb54d4d9fbb38d13acd19ed.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_8f19ca61a10d4fe0a207c6ebff6f114e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9a2ed9-4640-452a-9a07-453045e3566c/how_can_you_compare_simple_and_compound_interest.pdfIn PDF document text
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_2f8b0a25f9264e53b5cc379e18b51364.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbaa8e4-94e2-487b-923e-1421ee0719ed/45325785803.pdfIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_f00509c3328b422a806a205697f116e4.pdf?index=trueIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_59f5599bcb9647c697b72ba45781b2c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0efa52d-ff6d-4239-8532-8c0711785dd5/supilekerumugubimomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/594ebb61-f44a-4a62-a600-cb5aff984ca3/brother_j6520dw_wont_turn_on.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_334e31986cc8458cad6a53937385c07e.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_52d7f29abd434d04815acd65e19b2ad8.pdf?index=trueIn PDF document text
    • https://4c69d07c-928c-405f-a1ab-6436392658c4.filesusr.com/ugd/4c264d_6c2a3b8de49941a6ad06293d234851a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ed14b7-773a-4958-a837-1fcadbe99d79/98066383882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d69d06-592c-4080-8d74-17c83fdbc72e/nicholas_sparks_books_2020.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_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 5344 bytes
SHA-256: 2f147c87f2c54ae1b22e6057848edcde47bb7533029289523d111adacf02896f
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 10520 bytes
SHA-256: b399ce344367630a8d344c962337aa5970ab49b1883ef18b7d18f1b1802adf98