Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11b55738c40290f…

MALICIOUS

PDF

89.1 KB Created: 2021-06-06 02:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d805678c16fccf46e27c911c56dcc196 SHA-1: 308b7cd320c500151a86e52cbebde70dca2abaf3 SHA-256: e11b55738c40290f80c4311c80f971b54db8487a2fed844b22532fb22a7c0e04
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 0.9995

Heuristics 6

  • 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.
  • 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://catamma.ru/pbw?utm_term=dios+te+salve+mar%25C3%25ADa+letra+oraci%25C3%25B3n PDF link annotation
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/mofupuzozep_vagutepekes_nexevanikurev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419194/normal_604015dd2e29a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_60656d56e7ba3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_605d6f06322e5.pdfIn PDF document text
    • https://nesiwebe.weebly.com/uploads/1/3/5/3/135399888/9936942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_603d7e9b115c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_6065e009d1697.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/gawutadivebod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_601252c54642b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_606cfd8e64575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_60bc091e037ab.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
    • http://bojifimaral.pbworks.com/f/xuwunor.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/f/honda_goldwing_2020_price_australia.pdfIn PDF document text
    • http://nawujewo.pbworks.com/w/file/fetch/144689700/fezovewula.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144692397/78275944946.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/f/dojazusibozavubibobo.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/w/file/fetch/144573639/how_to_pair_skullcandy_indy_fuel_together.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144512025/dil_ne_jise_apna_kaha_full_movie_watch_online_free.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144663918/do_sezane_sizes_run_small.pdfIn PDF document text
    • http://felefejimax.pbworks.com/w/file/fetch/144523518/data_retention_policy_template_iso_27001.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144636966/tofupunij.pdfIn PDF document text
    • http://fevosezew.pbworks.com/w/file/fetch/144688770/59381731147.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_off00011199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 4980 bytes
SHA-256: 493388bd06e17243d1f2ad19aec3830b4f002acd92be6bc355a032e41ce07606
font_01_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 11436 bytes
SHA-256: dbd54ceb53bf2ae40d6f2800fb9e90833fa319d4ff168114dd34e18de9274585
font_02_sfnt_off000146b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333