Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f63f37ba890b454…

MALICIOUS

PDF

87.7 KB Created: 2021-03-05 08:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d3049064883372e49f5f89cba9fb3165 SHA-1: f931a94ec2524bf921bbc398b14b29035739a9f6 SHA-256: 4f63f37ba890b454359035a21cb96d52b95adce35b7f388eee1acdf359d8a5b2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to disposable hosting, suggesting it is part of a link farm or SEO scam. One of the extracted URLs, https://leonvi.ru/123?utm_term=knex+tree+house+instructions, is particularly suspicious and likely leads to malicious content. No scripts were extracted, but the PDF structure itself is indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/123?utm_term=knex+tree+house+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444853/normal_5fc5a19adf433.pdfIn PDF document text
    • http://begemotiks.fun/war_dragons_event_calendarl3vwj.pdfIn PDF document text
    • http://7gusevshop.website/best_english_conversation_app_offline44f69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380540/normal_5fe39186d9c8a.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/13180244688k07wq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425737/normal_5fcb1186dbb8e.pdfIn PDF document text
    • http://www.opentle.orgIn 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/56c00a3e-3b47-4fb6-aa40-94639e51b803/70534771469.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_8e8f8bc9a4d24d29bb45f95e860c08bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b146ad-6b24-404f-aca1-37abc359c246/danielle_steel_next_book_release_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc778ac7-8046-49d1-bea7-4ff87ca0dc7f/24408215666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/321fcca7-5bac-40a3-a2d7-3e8c1bb43faf/14186689710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f15b01-129b-404e-9cf0-503c2a8c94e8/64260999370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a0058d-e9c7-4033-86fe-8f32d2f00e79/97741608376.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_b0611a7da943406d90291d6bce53a0af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9166dd-21c0-48e3-b8b4-5dbefbf67a05/what_is_the_8th_book_in_the_harry_potter_series.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_e03b6a5bfecd4059a9c02656f08037a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/762f4f16-ec13-45ff-b65e-7bf6af04a388/home_zone_security_led_motion_sensor_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e208199-38fe-432d-adc9-f68504a39e1d/why_is_my_glock_36_jamming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03db306-fd32-4c20-9000-05c7aebaba80/24039911584.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_d4354c1756884252aeee5bac13f5cc17.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_acdce74b91cc4fe1a58db90f14a7fec9.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f521.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF521 12600 bytes
SHA-256: fb27670121e4273f228f0e5eb2b7d555b85ebf875e00b09d2b635f31b6374c25
font_00_sfnt_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 4680 bytes
SHA-256: 66cbf1f646afebed068c5cecb1b2c2245c93e322d3dfc3cd4a67fe2c3d53f099
font_02_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 10368 bytes
SHA-256: d7c298a575332c407f07456d183795efdf5cbb617b632c42225314decf57016c
font_03_sfnt_off00013be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE0 16268 bytes
SHA-256: 2e791c8c41ed92794a132cdadd0c8b73acf394ebc66d11a4d75e71f815b7fb6a

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