Malicious PDF — malware analysis report

Static analysis result for SHA-256 16270aff14fb9f9e…

MALICIOUS

PDF

76.3 KB Created: 2021-05-30 05:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 321ddb0c94c849deda35b7063d3af161 SHA-1: b17dbe3596b99d1c998204c575661b1560bf8023 SHA-256: 16270aff14fb9f9ef81612e007f8b0b9c481c68fdcf80818864ef396f39fb3a0
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 pointing to disposable hosting, suggesting a link farm designed to drive traffic. The primary URL, 'https://jottigo.ru/strik?utm_term=how+do+you+create+a+timeline+chart+in+excel', is presented as a search result, likely to trick users into clicking. ML and ClamAV classifiers strongly indicate maliciousness, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=how+do+you+create+a+timeline+chart+in+excel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479240/normal_5fda0bb7e518d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_605f8786e98d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413374/normal_5ff10fb68f1eb.pdfIn PDF document text
    • https://dezitatukuti.weebly.com/uploads/1/3/5/3/135389988/eefb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_60669484926dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418178/normal_6064c29293336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5ff3bc7dae17e.pdfIn PDF document text
    • https://pezasagizagifoj.weebly.com/uploads/1/3/5/9/135968908/134455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_6017275f551fb.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460972/normal_60b0a909e9703.pdfIn PDF document text
    • https://mufanujirube.weebly.com/uploads/1/3/5/3/135348440/fuwoxe_vejilizora_kopomigimit_lafud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5fff231cac420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_5fd2d2e42425d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_602291f554183.pdfIn PDF document text
    • https://sabopedawexidix.weebly.com/uploads/1/3/4/3/134305122/wukuweru.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/f73a54cc-ddec-47a5-a4aa-ebbf1a8937fe/91115981974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00847579-827c-4eaf-b461-bedce26bce85/14497880914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69e869a-4850-4d3d-b6d5-4a0a347aef10/how_do_you_charge_go_go_elite_traveler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efda1fa3-46e9-4f11-a370-a58dee519c35/how_to_do_beginning_crochet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eebe8f7-2586-4eba-913f-8e32d9cf2dae/felupusap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256ef91b-1f7a-4837-b8ba-bff5d679ef63/77465235375.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_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 5224 bytes
SHA-256: 29615d305765090b039a66d04e89ebf1fdd636a3e85dff9a80be48a2658c27c7
font_01_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 10332 bytes
SHA-256: e911013e50c3edffde94a9a5f9d85bf380114a5a053aaf84680212349579104d