Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f771609ad25f2e8…

MALICIOUS

PDF

83.8 KB Created: 2021-05-22 04:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 941aa4bcbbd63bd9fbb92e577bd14b00 SHA-1: d1c6d46437c3a928022b1d350b0994c3e37839a7 SHA-256: 0f771609ad25f2e873dac912aa7f8b0d8538ec584d6d11613db9e018f68149b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a mass of external links, identified as a 'PDF_SEO_LINK_FARM', with a primary suspicious URL being https://leonvi.ru/strik. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to direct users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=diamantes+gratis+free+fire+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451736/normal_601d6ac5c7c15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487622/normal_5febce89146e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_6029b2d5722c0.pdfIn PDF document text
    • https://depesusexufajev.weebly.com/uploads/1/3/5/3/135351117/sawoxekebataxip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461497/normal_5fe4bbe6b0608.pdfIn PDF document text
    • https://gejodaxavusaw.weebly.com/uploads/1/3/4/7/134708791/sotatumofavobajulami.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450634/normal_5fed10e2cb144.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/82c9a1ce-7f62-402b-865d-24c34d18012d/thomas_merton_no_man_is_an_island_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/83846179326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2112eb5d-2fe6-46f8-ad9e-26f52912bafd/metisuroziduzowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23b7db3-7e3d-4367-bd56-544920e2a850/zilosirivenulufeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd497949-136f-4c39-b430-90429f5ba552/jeu_de_cartes_a_32.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/english_action_movies_2018_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa07cd5-c87b-42c0-bd2a-f4694d0e2298/altec_lansing_mini_lifejacket_jolt_mount.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/what_fuel_does_a_5.7_hemi_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f18738a-e0e1-4d0a-a0ce-39b46980ec6d/the_measure_of_a_man_poem_martin_luther_king.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11528d07-2348-4846-8169-88af71b5c949/yamaha_digital_piano_p_255_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c688b95b-b093-49fe-a9d3-7a4dfd61ca96/finnegans_wake_italiano.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 5252 bytes
SHA-256: 1c185fa94e3839f8bab881423ccd1d21c29dbdec7a1f2e5a9c52756a99f22b5a
font_01_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 13392 bytes
SHA-256: c5728d9432ec9655304e5f6f0f01131aee1e347d90249f6fa7d48ebb85637d80
font_02_sfnt_off00012b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2C 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

Open this report in the interactive analyzer, or submit your own file for analysis.