Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfd17788019bf8a…

MALICIOUS

PDF

107.1 KB Created: 2021-06-06 12:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3ba5ac9e120dcaf76d9a4bc7920ebaf6 SHA-1: a23eecc2fa8cd5b385ef5577812fa9b4fc46feca SHA-256: 2cfd17788019bf8a132243578a193a87095e9b821a1ecdeff66b1d41f6d7f4c8
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, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/pbw?utm_term=pastorela+navide%25C3%25B1a+guion+teatral+para+ni%25C3%25B1os PDF link annotation
    • https://jijajaxasivezix.weebly.com/uploads/1/3/4/5/134588510/vevav-murupazen-jojiselegezem-jimeromuwaku.pdfIn PDF document text
    • https://surejijal.weebly.com/uploads/1/3/4/5/134525532/lixel-zabanevobi-weminarogo-pewozen.pdfIn PDF document text
    • https://penatiwateli.weebly.com/uploads/1/3/4/6/134617533/4314168.pdfIn PDF document text
    • https://lufotoloxa.weebly.com/uploads/1/3/4/3/134318907/gemap.pdfIn PDF document text
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/2986736.pdfIn PDF document text
    • https://fijudemi.weebly.com/uploads/1/3/4/4/134400988/4085256.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/fidowirubu.pdfIn PDF document text
    • https://milanabez.weebly.com/uploads/1/3/2/6/132695465/dediligolitedomin.pdfIn PDF document text
    • https://didipovewefof.weebly.com/uploads/1/3/4/3/134306756/8f267927ffb.pdfIn PDF document text
    • https://vifunufuwo.weebly.com/uploads/1/3/4/5/134596702/660fb.pdfIn PDF document text
    • https://lenusasifelodu.weebly.com/uploads/1/3/4/3/134350773/118707.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/406a06087901e11.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/sufevizox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144664017/jolaxexadavuxep.pdfIn PDF document text
    • http://vedufid.pbworks.com/w/file/fetch/144530178/principles_of_economics_7th_edition_mcgraw_hill.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144532602/88622763388.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/granny_chapter_two_mod_menu_2021.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/f/4061169465.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144467625/how_much_weight_training_for_fat_loss.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144414987/ace_combat_7_trigger_x_rosa_fanfiction.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/what_are_the_28_fundamental_beliefs_of_the_sda_church.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144453609/driving_simulator_2020_apkpure.pdfIn PDF document text
    • http://kesowununak.pbworks.com/w/file/fetch/144720249/87647634730.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_off00015eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAA 5400 bytes
SHA-256: 4529451c987809db96b50cb23f4bd4ea998f5ab94db48d9c0d0dca657958bb1a
font_01_sfnt_off000170d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170D6 13496 bytes
SHA-256: bcb30fecac6e77e87a5d6900c42151fb195e01c23279d4065190ec834c1cb181