Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b30a2fca4ac5523…

MALICIOUS

PDF

81.1 KB Created: 2021-06-02 17:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b5a01ba6c2f8ff00c87fdd246376d2ae SHA-1: 5a92af669de49c221ccc42dff43a8cec5cf7c9c5 SHA-256: 3b30a2fca4ac5523991a76a2fa5cfd78cc4764b5558cc7ed889e9ec4b87a3458
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 0.9996

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://infrive.ru/pbw?utm_term=el+pianista+pelicula+completa+espa%25C3%25B1ol+latino+online PDF link annotation
    • https://nuzukozifazo.weebly.com/uploads/1/3/2/6/132682871/8c2833c0bd4c.pdfIn PDF document text
    • https://ridakikasidom.weebly.com/uploads/1/3/0/7/130739592/mekejowagim_zizup_negukediv.pdfIn PDF document text
    • https://soxodoma.weebly.com/uploads/1/3/4/6/134695887/futif-tozupo.pdfIn PDF document text
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/c23a981fb5.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/29625a20-a068-4382-a309-177fc1f4cab2/vinakurej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13df05f-d63c-4d75-b7c9-5c281891add2/5878933445.pdfIn PDF document text
    • http://joxupakager.pbworks.com/w/file/fetch/144488844/27235776316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5816dae-abea-4bc3-a842-9766ce0c7298/dikizizizakokububeli.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/vilub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185a6a58-6869-40e5-a48d-4151ea8e10da/star_wars_battlefront_2_cd_key_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e192dcb0-b39d-4ef9-ae37-0e776a9cf309/tugidijefazamopem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3297911b-395f-4233-a5ae-7c9bb8683631/derarulejajuvo.pdfIn PDF document text
    • http://vananizi.pbworks.com/f/nfs_no_limits_ios_hack_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/855c6bde-8213-41b1-a46a-737e429823d4/kafutidogozos.pdfIn PDF document text
    • http://gulisapil.pbworks.com/w/file/fetch/144419478/2399264410.pdfIn PDF document text
    • http://magobok.pbworks.com/w/file/fetch/144497793/calculus_example_problems_with_solutions.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144419736/98793642044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c7fc89-e8da-4f39-a6ac-d5afd23ac966/66308178990.pdfIn PDF document text
    • http://jumedew.pbworks.com/f/wakujowaxenutizid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/234dd015-d148-4f96-91a9-5d8c3af72d99/98415352571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52bc32e-bb79-44be-9a91-29164fdcaf3d/my_hp_monitor_keeps_going_to_sleep_mode.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_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 5152 bytes
SHA-256: 6a1588bf7436ecce9f126d86741449b8d1bb5ede218e23d8adc6c6d5328b96d0
font_01_sfnt_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 13096 bytes
SHA-256: c81266947b4d72cd98ecd3553e2c5bcc0e7d638587b1f709bb1a50afbb897388