Malicious PDF — malware analysis report

Static analysis result for SHA-256 243af17bc1d91129…

MALICIOUS

PDF

72.1 KB Created: 2021-03-27 16:13:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 07b0e5fa04cbd5398a8d1f437a9ace89 SHA-1: ef6af92b7ef629565f17bc92dc32624296e0d0f6 SHA-256: 243af17bc1d9112924490e55bd2d182c84ccb17d21945e1dc28e1cf2ef4af533
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=albeniz+sevilla+guitar+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_602a203561a44.pdfIn PDF document text
    • https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/viriv.pdfIn PDF document text
    • https://tovuwofox.weebly.com/uploads/1/3/4/7/134731163/dowanimajo_nosaj_wuvewi_xeniwixurufom.pdfIn PDF document text
    • https://wokepugef.weebly.com/uploads/1/3/4/9/134901336/bffc7cb206b9dc4.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/vufinobavadawa.pdfIn PDF document text
    • https://lidawutoroliv.weebly.com/uploads/1/3/1/8/131872032/kefojubuso_zekekosomatob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410731/normal_60051fb9cef56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494139/normal_60132d6a4f10a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_6034f7b1c3c2b.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/xidamuleweluti_faxepo_jixir.pdfIn PDF document text
    • http://nafewid.sportsontheweb.net/exerccios_de_anlise_combinatria_com_resoluo.pdfIn PDF document text
    • https://jevemiparo.weebly.com/uploads/1/3/4/5/134501543/turitarenigujan_nibisokimizem.pdfIn PDF document text
    • https://jisasulozif.weebly.com/uploads/1/3/4/3/134371627/5802964.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/lolexokege-kofiviwabuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_6015301976f7f.pdfIn PDF document text
    • http://jizerigozigalav.getenjoyment.net/blues_scale_chords.pdfIn PDF document text
    • http://vugaganopofom.mypressonline.com/importance_of_teaching_phonics.pdfIn PDF document text
    • https://kisivapatefiru.weebly.com/uploads/1/3/4/3/134333063/buwej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pizuzol.onlinewebshop.net/perexosajel.pdfIn PDF document text
    • http://buzanuziti.myartsonline.com/revised_common_lectionary.pdfIn PDF document text
    • http://radagosedapisat.epizy.com/noxefolawaxoba.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/86992943125.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/45209013736.pdfIn PDF document text
    • http://puvipul.epizy.com/cub_cadet_xt1_46_oil_change.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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 5448 bytes
SHA-256: a51e1a9f15981b14a490cec39528a033ac74effb679b327f2cccd961914467b0
font_01_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 11780 bytes
SHA-256: f5e60e73a01fff1552f7531194f3c51497e1e0bf0386db3d6dc5b351e783a9cf