Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5850b569fc7b331…

MALICIOUS

PDF

99.6 KB Created: 2021-03-29 02:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d852f0849038b3874a7c38b9e18bb390 SHA-1: 94ad6fc2a0da59d87b05eb16366ab4726dc11b4a SHA-256: b5850b569fc7b331db9f3c2698ff738a1aa43ab9e166580fe23f39c06044f1f4
244 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a redirector link and a large link farm. The document body, though heavily obfuscated, contains text related to a 'Nordictrack exp 1000 manual pdf', suggesting a lure. The presence of numerous external links, many hosted on disposable domains, indicates a likely phishing or SEO manipulation scheme. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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/strik?utm_term=nordictrack+exp+1000+manual+pdf In PDF document text
    • http://womizepivilora.sportsontheweb.net/kenetopifagar.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/tomagix_nepegeg_redetowivetipun_woribuzixawiwux.pdfIn PDF document text
    • https://wonumajogo.weebly.com/uploads/1/3/1/3/131379434/ruwuruw-domerazo-bumorodemigemo-vuwelomos.pdfIn PDF document text
    • http://jologedeb.getenjoyment.net/leadership_theory_application_skill_development_free.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/lusewunefugepox.pdfIn PDF document text
    • https://xikixunajaxata.weebly.com/uploads/1/3/5/9/135959014/tetalijomakejod.pdfIn PDF document text
    • https://dibekojiworibo.weebly.com/uploads/1/3/1/6/131637919/4904937.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403952/normal_5fc82705eee39.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/vujukeruraxunuvunamav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_600a1f861a280.pdfIn PDF document text
    • http://selizixid.iblogger.org/busca_de_currculo_plataforma_lattes_cnpq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab6e155a-389f-4999-975c-fc1eb02be2c1/29097471536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30add221-712f-4e64-bb81-2b9821f5e498/what_to_do_after_free_code_camp.pdfIn PDF document text
    • http://ragudoduwe.epizy.com/jikanupaxukusudoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/015d1081-901c-49e9-8e11-477046febc7b/what_is_capped_brood_bees.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_off0001447e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447E 5420 bytes
SHA-256: b50bd20e67149506cc4544463b89dc382392bba4377fa2f00cc3b0cdd9e9f160
font_01_sfnt_off000156ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156EA 12372 bytes
SHA-256: 7cf0b285dcec1e2f19b3c75f0b49d46bf34d00364d47bc560f3f11026ba7cc33

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