Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bf17f15971a659…

MALICIOUS

PDF

89.4 KB Created: 2021-03-29 08:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 34c0845e5a1a1703af0ac65971326d25 SHA-1: e10c82a50752497ebeb7aabefb713a0b58b78fe0 SHA-256: c1bf17f15971a6597deae46bc5ddaa63c517a89c6dd2af43c07c92da0431aa66
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jacksth.ru/wix?keyword=powers+of+congress+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476001/normal_5fe2384b3ed15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372354/normal_5fc7a181102bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_603e91433a851.pdfIn PDF document text
    • http://jsexj.fun/how_much_will_a_covid_19_vaccine_costvpztw.pdfIn PDF document text
    • https://besikutusesa.weebly.com/uploads/1/3/2/6/132681218/870208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393488/normal_5ffeaa5bd7e52.pdfIn PDF document text
    • http://raxuzasi.iblogger.org/vsco_full_pack_2018_mod_apk.pdfIn PDF document text
    • https://zivukiwele.weebly.com/uploads/1/3/4/7/134749768/9034551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_6013a3489b35c.pdfIn PDF document text
    • http://bupro.asia/vagimitutegedinerikuzx65b0.pdfIn PDF document text
    • http://fastgetme.online/synonyms_dictionary_for_pcklhco.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/how_to_make_toga_himiko_in_gacha_life.pdfIn PDF document text
    • http://desekikimok.22web.org/android_room_tutorial_kotlin.pdfIn PDF document text
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/tubonegaxoruko.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/ravifigilo.pdfIn PDF document text
    • https://moramiwise.weebly.com/uploads/1/3/4/7/134736235/kosat-lexes-katewigukug-jowinugar.pdfIn PDF document text
    • http://nalodorepuwag.getenjoyment.net/libro_de_fuller_instrumentacion_quirurgica_descargar_gratis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_4f8ddda4b85a49849722589e143e0d6a.pdf?index=trueIn PDF document text
    • http://zagupijalixi.myartsonline.com/ap_grama_sachivalayam_syllabus_in_telugu_2020.pdfIn PDF document text
    • http://vojapexa.rf.gd/73904071818.pdfIn PDF document text
    • http://gekokapemux.epizy.com/93212701410.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_05d2acf661f14dbd81691b86b734c956.pdf?index=trueIn PDF document text
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_0dac848d6fef4d929d86ed3c310012f8.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_8943f3ee8f0446e497eb9e287a699b03.pdf?index=trueIn PDF document text
    • http://zajasiw.rf.gd/35721706329.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_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 5332 bytes
SHA-256: 16f6889fdde810e1dfc59446ae5edb082e91c32ce55780b56d44d9a47952bffd
font_01_sfnt_off00011926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 11600 bytes
SHA-256: 8bc130db0f6f9fbcf2e12e44cd2bc04b276ba5759d272958b4f90a15e1b17d9b
font_02_sfnt_off000140c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C9 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c