Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf36fdf817321a4…

MALICIOUS

PDF

76.3 KB Created: 2021-03-17 20:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1255315e6a9e373de9b01391a86b8727 SHA-1: bbacf0b2b8c7f0d9a2a80c115e4d79f83a5d9c7d SHA-256: 5bf36fdf817321a4a4b505ab95bafbb3d23245172825b580dec71a55da689325
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 0.9990

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://druttle.ru/award?keyword=cancha+de+baloncesto+con+sus+medidas+pdf PDF link annotation
    • https://cdn.sqhk.co/madilaxetevo/gfg4ja2/gojajubikatomujuluge.pdfIn PDF document text
    • https://cdn.sqhk.co/dedizozife/ghvrAd5/fubisavomifin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kulisiwodomewa.epizy.com/veniroredamaduradi.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_00d95d2ba7a3434a8ee11d7a8f3d7ecb.pdf?index=trueIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_6d77026ed98e4d758c7c5d195cae0068.pdf?index=trueIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_83db4e88f0e34c61a206c8e8710d7e28.pdf?index=trueIn PDF document text
    • http://pegawatovejugav.epizy.com/quality_management_software_for_manufacturing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159fdeb2-bcf8-481b-9257-ba2aa59486d7/fojakoviwel.pdfIn PDF document text
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_7ec1c21a49d24e51a1babab298feb762.pdf?index=trueIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_9d1e662a73fd4dfaa9cd71bb4d6998c0.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_1638b8f5114e41e99166bc7e8c3b8629.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c289d80e-6e6b-4e40-bdf7-a7af2adcc815/75663941761.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_0e88e1f65f6c4c32b4f918127c3409f9.pdf?index=trueIn PDF document text
    • https://aaf8962b-2ea5-4403-bfea-7c32f2b3f77e.filesusr.com/ugd/8f3a65_d0c264ae83324335aab9bbc6e9937f77.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_b9bc57e50d4c44cc874ac9ae6dac471b.pdf?index=trueIn PDF document text
    • http://zebusodevig.rf.gd/character_formation_nationalism_and_patriotism.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_35f97010b3594ef5acfe1ab3f93d9982.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 5344 bytes
SHA-256: fa62fc00971938addb75f9752519deafccd6beef9df3c9e9cc939b55589f093e
font_01_sfnt_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 11436 bytes
SHA-256: 8d2a9c563bff9c6305ed268f316d55b7ce9f04e97cee4acb7a2f727a0819e023

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