Malicious PDF — malware analysis report

Static analysis result for SHA-256 b047bce8e67c6bb3…

MALICIOUS

PDF

75.2 KB Created: 2021-03-09 23:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4e01053080db4604a87c1ffd14cfb2dc SHA-1: ec55467bdd235306f4a7d5c660fa09b495ee9930 SHA-256: b047bce8e67c6bb3991692c2f67be27dcd8aad992ea5e4e8c116340d7f46250f
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to disposable hosting. This behavior is indicative of a link farm or phishing lure, designed to redirect users to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=danny+boy+celtic+woman+sheet+music PDF link annotation
    • http://lefavapexusa.iblogger.org/18265688043.pdfIn PDF document text
    • http://jerusitujuj.22web.org/vifoso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_f19db63ff8c742b984b99f0d39a9e15e.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_ff791ea862054495ae17246127aa2c66.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_4dc15065d6ff48b4aede63ddb5602344.pdf?index=trueIn PDF document text
    • http://letituxis.epizy.com/64045964575.pdfIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_5f986fc107fe4e97ae2a5f13bd117343.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c65f44-ebb5-45a5-8083-36898c73447e/algebra_lineal_para_que_sirve.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_f8d557e6d66a48efac6ccc03cb126a07.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_78aa1fbb1226420b852a11ab0ecf5d41.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_b0daf23bff0b4fa49de4e0cdf04ec6ae.pdf?index=trueIn PDF document text
    • http://sorajapiliwixod.rf.gd/love_failure_songs_whatsapp_status_telugu.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_5fd32ac0950f404db35ede34482249ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0538bfac-e310-4756-a6ed-ce738f4e828c/7217015955.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/romupiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6540f8-6aed-4c54-a8c9-7f9d85306b84/broan_stainless_steel_range_hood_30_inch.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/65915157240.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_da274e61c7e24035aae1d16602c01cca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a64d9ac5-7f2f-423f-9b8d-04d98b216f49/vizio_36_2.1_sound_bar_system_manual.pdfIn PDF document text
    • http://vosimamasi.epizy.com/lufarududiwesezajapadaw.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_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 5276 bytes
SHA-256: 180af876486c29b79338bf1e9fba9529fe3e0b4143b0e26edf1dffb21a37b806
font_01_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 12136 bytes
SHA-256: c2de8ff4a39623a17e2d3166b0ee020b0ea109c66d9e44d110f07f3a899c5965