Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd907971d6a832a4…

MALICIOUS

PDF

72.1 KB Created: 2021-02-25 15:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f0bf8e3d36d2a9343f1082a6c49db129 SHA-1: 03b803a0eeb540f16ba60a170d2784b583559105 SHA-256: bd907971d6a832a46cdd459acf5255f4552610e4892a53a4afa7d9cd639f3321
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The document body, though heavily obfuscated, suggests a lure related to 'naming ionic compounds worksheet answers key'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content.

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://seumenha.ru/strik?utm_term=naming+ionic+compounds+worksheet+one+answers+key PDF link annotation
    • https://cdn.sqhk.co/sepokafaru/RKicihE/daluzu.pdfIn PDF document text
    • https://lisumefi.weebly.com/uploads/1/3/1/4/131408082/xamiwuvu.pdfIn PDF document text
    • https://jamofidomub.weebly.com/uploads/1/3/1/3/131398059/ca127.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxumisi/KIGilgf/wwe_raw_2020_live.pdfIn PDF document text
    • https://cdn.sqhk.co/xigofidiw/Rhe4gfW/wofurekiri.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/9dcc08773d.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/gihaFic/gilesamabipanemovupojopox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417046/normal_5feafe8b415d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_600efa59365b1.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/cjjhgfl/jungle_animal_hair_salon_2_mod_apk.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/why_does_my_samsung_tablet_keep_powering_off.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_600b1d67f197e.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/is_washington_dc_open_for_travel.pdfIn PDF document text
    • https://xaperosojemi.weebly.com/uploads/1/3/0/9/130969510/add9612f0138f30.pdfIn PDF document text
    • https://majotowuwirup.weebly.com/uploads/1/3/5/3/135346036/bogerifexin-gusuge-sunedijaf.pdfIn PDF document text
    • https://cdn.sqhk.co/fagojefavap/idhhajF/26892397665.pdfIn PDF document text
    • https://mumilupoj.weebly.com/uploads/1/3/5/3/135351188/83d50d944d71c.pdfIn PDF document text
    • https://gefotumazemi.weebly.com/uploads/1/3/5/3/135331531/7213849.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367640/normal_5ff5c1593180a.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/njihbhd/i_am_death_destroyer_of_worlds_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/gem_of_the_ocean_full_play.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_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 5684 bytes
SHA-256: ae826ec228b65a7535fde5e026b9e292abd5b7d31ce2d969148645fee25f6645
font_01_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 9708 bytes
SHA-256: b81e510f267f2a1be6f447cf1d55e82772363e2c61bd422eb6bffb57b3fb52ab