Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3e60837fd0b53f…

MALICIOUS

PDF

77.1 KB Created: 2021-06-08 23:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f34c2015e788fffa9b008860560c07ae SHA-1: 4796f4a7b50331221129f03db13b85a47fbe9b93 SHA-256: 8c3e60837fd0b53f3ae729cfa86cea5a503ed5f5246a593c6e42bda4fda793ad
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 distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/pbw?utm_term=moment+of+inertia+problems+and+solutions+statics PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4366969/normal_60b2e97855498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487200/normal_601f20852c23c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448743/normal_5fdf86c57c541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_605c6ee53a891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_6043538480c0e.pdfIn PDF document text
    • https://bilewemebit.weebly.com/uploads/1/3/5/9/135964156/8293957.pdfIn PDF document text
    • https://pegugaxuxidugif.weebly.com/uploads/1/3/1/1/131164321/2291988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_603171e088e8a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4406787/normal_60b4ea29cb067.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450041/normal_60b00bf8806b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381294/normal_60048a5dcc95f.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/xixudulavupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409411/normal_5fe30e034c2f5.pdfIn PDF document text
    • https://nesojikav.weebly.com/uploads/1/3/1/3/131398336/pazalefo-bofupulalunuf-galejek-foniwigafabe.pdfIn PDF document text
    • https://migigazafakag.weebly.com/uploads/1/3/4/3/134377970/gemitubuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_606c8fbe78212.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/81bd0677-46d7-4f05-ac34-d9849b120355/isometric_drawing_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519c61d2-f6df-4613-9879-f1fffb222de2/property_disclosure_statement_bc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/004a9fa0-67d6-4623-9486-c2356fccfee2/xotafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a79ad0f-3176-4116-9b31-47dc675dc0ff/how_to_turn_on_wps_on_xfinity_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67723ad7-c9e7-4d1e-9a64-0c0a442e66fe/weight_training_gym_routine_female.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892ef8a6-07ea-46d0-90cb-b19ae92818ec/which_is_better_convection_or_inverter_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd211691-2fb7-4e15-8cef-b4b5dede6d52/guitar_tapping_techniques.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_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 5448 bytes
SHA-256: d3ec2ce45248514f9d9999c3bd0e0d9ca600b58184cd66fcc52d1f2a5e368b9f
font_01_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 11116 bytes
SHA-256: 74f8b92b971936995b276b55d2c3b9098b0592202afb3927c9516909a3b64471