Malicious PDF — malware analysis report

Static analysis result for SHA-256 f655808a1107bea2…

MALICIOUS

PDF

79.2 KB Created: 2021-03-25 02:02:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fc066b273a8c09c44e8df69d83e68bce SHA-1: d5ce6b07e0d5c2da1cce117aa4e8ae3b34e7add2 SHA-256: f655808a1107bea2c6dd7659aa2a06d1788c7524b51e1663fbf6722af2489581
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, which are likely intended to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=general+data+protection+regulation+consumer+rights PDF link annotation
    • http://gufutaca1.xyz/fefozotokubk6fuj.pdfIn PDF document text
    • http://dombitarf.ru/beduworixulouozkt.pdfIn PDF document text
    • http://24goodstore.site/bunny_cartoon_image_freeyyacs.pdfIn PDF document text
    • http://qrastenmap.online/clasificacin_de_funciones_ejemplosj5k5e.pdfIn PDF document text
    • http://save50it.info/xubiwibisejinixijuzarqpftz.pdfIn PDF document text
    • http://it50save.info/how_to_turn_on_hamilton_beach_commercial_ironzj7lk.pdfIn PDF document text
    • http://photoforce.ru/printable_clock_template15ym4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xajowu/nefupokivitaturu.pdfIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_992590d263d94409bed1ebf166e70f0b.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_31ec0de0a0da4da48ec78a52813f2371.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6f947c-e28a-45bc-8f2b-bc6587f29d09/22860528616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a5d708-7a7b-48f0-ae95-a0b9e71c7eeb/do_halogens_have_coloured_vapours.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_b9af36034d8d4fcfaebcecb6679dc639.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifuto/software_engineering_handbook_unsw.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_770946f50ad94260be9d2942af548e90.pdf?index=trueIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_50ce3248add14870842e4a60d8d0b51d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5746cd1-2078-46fa-8669-d80a4969e7eb/how_to_make_maggianos_baked_ziti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e1b354e-5aa6-48a9-8ccf-a86089257b43/fikakupafijaniku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d947dc9d-ddd0-4442-a14c-98d118a92e85/loxuvafukoxolupoxag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 5400 bytes
SHA-256: a1fdcf2ccb529d59866c3ddfa07b0cabd441730d8673aed8616eb4accb6e5aca
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 10560 bytes
SHA-256: 65b763975bb497c55a13cdf4e2918ab9195e18f79265f2588631ae6a2ac5849e
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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