Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cd2763fe3944bf…

MALICIOUS

PDF

78.3 KB Created: 2021-03-30 15:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: cb00ad24189492ec45b7fada7724d83e SHA-1: b4ec1b0e55293d1ac05530e3a37c67a9cf5b01c1 SHA-256: 77cd2763fe3944bfce87384b24af506a27ff404dfebbb8570f432d5ecd4c435a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to external URLs, likely to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/award?keyword=mordiendo+manzanas+besando+sapos+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488572/normal_6052fd4920a47.pdfIn PDF document text
    • https://fekamudubop.weebly.com/uploads/1/3/5/3/135325245/rifutikujabane.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/lefimi-feterozut-xoliluxip.pdfIn PDF document text
    • https://rimowaxa.weebly.com/uploads/1/3/4/6/134610435/5395443.pdfIn PDF document text
    • http://potenciy.xyz/ethnography_project_examplesxlvfa.pdfIn PDF document text
    • https://kasipuxatupar.weebly.com/uploads/1/3/5/9/135966953/4a622e93b095dc4.pdfIn PDF document text
    • http://xozivupanivos.22web.org/how_to_make_a_3_circle_venn_diagram_on_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_602be2c1d25b4.pdfIn PDF document text
    • http://fashion-deals.xyz/pevaxatiwnd7yp.pdfIn PDF document text
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/segovukanovezez-fozik.pdfIn PDF document text
    • http://erogan-columbia.site/24618443705un47z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408701/normal_601070a2592d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5ffa424ac6a5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_60181bacae400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_90db9507e45641bcbb6f18566d959266.pdf?index=trueIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_ba83ca54a0e840afbc8a23d7ed69446b.pdf?index=trueIn PDF document text
    • http://lawekapijef.epizy.com/menivovonelugolovarisa.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_94329bd524fe4a37922385255e1be27d.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_df41ff1b310a4823b4ea391e383cbf35.pdf?index=trueIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_6e6f5fa89d6341f9a5f9125a8e2a1fc9.pdf?index=trueIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_34d96303db034a9dbf2533ff4dd1ec4b.pdf?index=trueIn 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_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 5348 bytes
SHA-256: 5511c9e7f8cb3c941a3d2b9f25fc19020795a151965ec4e04df36e2a5e22f987
font_01_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 12240 bytes
SHA-256: 21737e6fe9d654b41956a433487075e3998a3a09dfb2b22f18e936ae23847a05