Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cd07e7df7a548c…

MALICIOUS

PDF

76.1 KB Created: 2021-04-08 08:39:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 037bc90b74f515c87cf39b83c558630f SHA-1: e4e54f44f6a4d5e46463996219597f6302f2861d SHA-256: 51cd07e7df7a548cf989d509ddbc258e3e4d8788a3e15a3847fa8f7ed0c59d1c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with a primary URL pointing to a keyword search result. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to a specific book title, further supporting a phishing or content-scraping attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/wb?keyword=divina%20com%C3%A9dia%20pdf%20portugu%C3%AAs PDF link annotation
    • https://pakupefo.weebly.com/uploads/1/3/0/7/130776676/dda3dd3.pdfIn PDF document text
    • http://mists.space/sonawyvq9k.pdfIn PDF document text
    • http://termo-nord.tech/dungeons_and_dragons_4e_character_sheetttlyv.pdfIn PDF document text
    • http://pubguckazan.com/33741521378563xy.pdfIn PDF document text
    • https://waxujonugo.weebly.com/uploads/1/3/1/8/131871493/favitulex_gisevezixobopor_desilutosiz.pdfIn PDF document text
    • https://kesizibewasi.weebly.com/uploads/1/3/0/8/130813921/genajivu.pdfIn PDF document text
    • http://mini-camera-super.club/55123082880oiyh0.pdfIn PDF document text
    • https://pudavupotel.weebly.com/uploads/1/3/5/3/135335197/e5533fe5ae7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_27c37e54ef834af0a6c973de00f21a0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b6863f-ccde-42b8-b5b9-9d7078a1d571/fuxikofenajitizugo.pdfIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_26f6aeadf89643228a1d0b6b32319f02.pdf?index=trueIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_2cb1d5030a37410a950bb7fcd646dcbf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73bed22-7aaa-4dc7-8f64-6181c19362cf/catia_v5_tutorials_mechanism_design__animation_release_20.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_e99871fe57a54d02b71c2627199df7d8.pdf?index=trueIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_9586d1b9f0404e839fdc4d6ecfb9e51a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b07260-b22d-4998-b3d2-89653588bbd3/dirt_devil_cordless_hand_vacuum_reviews.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_1d282bdde17f4c6f8a56297ccb285a69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce4c6c2-2679-4b96-8b7b-a71ab5974b84/the_secret_of_ages_book.pdfIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_eea11c3660bc49658f3b3528289d3e30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/915567f8-0f7b-432b-9c3e-e2272d6bc608/56659703998.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_0ee3b461600e4186a015882c168f947e.pdf?index=trueIn PDF document text
    • https://949217f6-ecfc-4a1b-8806-967b2a145102.filesusr.com/ugd/b08fd2_3a12173990d9493ea8ca07da4f4afd28.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_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 5796 bytes
SHA-256: f0ed4b7ab7bd7590efb63f012e66c810aa478bd8ed95d32bbf53829242797a39
font_01_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 13000 bytes
SHA-256: 322cb9109d1edfae2de29aaca67d42aca8ff32cd6426a900547d7e07e5fd686f

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