Malicious PDF — malware analysis report

Static analysis result for SHA-256 362c7f5b04ac4153…

MALICIOUS

PDF

79.0 KB Created: 2021-03-14 15:55:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b834bd4cfe7a423ed1d071958d0cf550 SHA-1: ca5c06663c747e443a91d0a862a84130e9acfae0 SHA-256: 362c7f5b04ac415359853be05771c81b51f222ac5880404dbc12dc25543c686a
206 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://kuzutuzo.ru/strik?utm_term=annke+sp1+ip+camera+how+to+setup+wifi', is particularly suspicious and likely leads to a phishing or malware distribution page. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kuzutuzo.ru/strik?utm_term=annke+sp1+ip+camera+how+to+setup+wifi PDF link annotation
    • http://wejaduz.mypressonline.com/hamilton_beach_dual_sandwich_maker_recipes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475741/normal_5fdf554800eda.pdfIn PDF document text
    • https://cdn.sqhk.co/rasirise/hSwhggc/rulez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5ff15b9576b19.pdfIn PDF document text
    • https://dobuzitususuv.weebly.com/uploads/1/3/4/4/134470967/timaxib.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/ijdXggA/not_to_do_list_examples.pdfIn PDF document text
    • https://bukiwajomudaf.weebly.com/uploads/1/3/4/4/134437050/dabunupame_wikemolepoxezit_rixemafodaxav_xofexururo.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/25922b8befa9.pdfIn PDF document text
    • https://vonebofakakare.weebly.com/uploads/1/3/1/8/131856314/vogaxur_wezasamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485935/normal_6021d7345b16f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_889d877e0a7b4aca8ec042e69aec93b6.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_8bf67d0359f34f60a5e856c7ed18ea15.pdf?index=trueIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_ce82de04673f41b5a5ea499dddd7b72f.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_8c5392b072494932a454e0b5e2b6fef1.pdf?index=trueIn PDF document text
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_338283b913f84f1b88fc7c972c90db70.pdf?index=trueIn PDF document text
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_9da621c3380d40048b6205f46753657e.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_6706ca87b408488e80f20ecb98a1c4f6.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_1cdfcaa6d1044bd08ab84ef9e2b9569d.pdf?index=trueIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_812d36a94f0f49eeb8741584a7a3bf46.pdf?index=trueIn PDF document text
    • http://womawujun.atwebpages.com/cuanto_es_el_salario_minimo_semanal_en_mexico_2019.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/cecropia_peltata.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 5420 bytes
SHA-256: b920ab4c98eeab08945911d4a577a2ddb29d47055dafbfb0b52cf62ca4c2074b
font_01_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 11924 bytes
SHA-256: 5a6dced77a4521ea97ba84b392d5913ab7b455289f29c7b8c96e9720334b7086

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