Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22c90e26377227f…

MALICIOUS

PDF

77.0 KB Created: 2021-03-26 08:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c57bcd19d7bbae2210a78af060a1bd1f SHA-1: 53ebbdaaa07703cdc0f1d6f49279f8b291e29444 SHA-256: a22c90e26377227f3cf94a0e12821b49f614e68eaa4d45553015d5455f12e0cf
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites.

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://resalured.ru/award?keyword=astrolog%25C3%25ADa+maya+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498882/normal_604d327abcdab.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/paul_bragg_books.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415070/normal_5fe118a83bc25.pdfIn PDF document text
    • https://mumujikik.weebly.com/uploads/1/3/4/8/134896301/5439093.pdfIn PDF document text
    • http://perfectiona.online/mimadusezoxabidxcsob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_5fe7dc102f718.pdfIn PDF document text
    • http://igafnd.org/words_that_start_with_phonosztli.pdfIn PDF document text
    • https://sozuleku.weebly.com/uploads/1/3/5/9/135962343/46372d6e.pdfIn PDF document text
    • http://retys.space/mediasonic_probox_hf2-su3s2y769v.pdfIn PDF document text
    • https://bonavipopugob.weebly.com/uploads/1/3/2/3/132302892/146c1ac1c73.pdfIn PDF document text
    • http://bebalezuve.medianewsonline.com/pulse_oximeter_manual.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/d6a4c165-5906-406d-92b5-291c7fb719a1/bugagibuwukaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d87da2-7d8c-47ce-a54f-9e5de98db13c/xunuvijilasisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac8e92c-ecb4-4d5d-979c-314bf74ee7ef/what_kind_of_bread_can_i_eat_on_an_anti_inflammatory_diet.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/44324201483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1886df9-1d24-4b01-99ad-a7e5dae50f40/lucent_english_grammar_book_for_competitive_exams_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba2f9ae-1ca7-4308-ba51-cd612cafc1c2/66152637624.pdfIn PDF document text
    • http://tajavuminona.atwebpages.com/55390886991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609e948f-d04d-4080-99db-29d45ec1de90/7143474474.pdfIn PDF document text
    • http://rakixufemagotut.atwebpages.com/9284041682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5328e97d-63a3-4f97-9431-d00b1530be87/how_long_do_you_cook_eggs_in_pampered_chef_egg_cooker.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_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 5504 bytes
SHA-256: e8c367ee2b365eb12b179e355576f5e05ad87f964d26e933e120279e7d51813e
font_01_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 12784 bytes
SHA-256: 0350bf6a0e826a3da68f41de00f828a3a555995c21bc29e9e9f3b15c02b92a9f