Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f51edc5a13ff97…

MALICIOUS

PDF

77.7 KB Created: 2021-03-10 05:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 828651754fa78dbc951e183c56dbdd31 SHA-1: 27fcffd4b0a4299bc8761e98f10de235f32fc457 SHA-256: a3f51edc5a13ff97ebbaccdbf70584f17bd4738dfa3363c7ab2bfe3cfcbd81b4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jumiwimov.ru/award?keyword=panera+catering+menu+prices+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447101/normal_6044c9ba95dc8.pdfIn PDF document text
    • http://skout.tech/vudumifozb4wuh.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/7665286.pdfIn PDF document text
    • http://mosdendy.store/pudisikobofiw9xu79.pdfIn PDF document text
    • http://activa-fb.com/the_piercing_bible_download_freeyshwv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385862/normal_60250ab8b06a7.pdfIn PDF document text
    • http://help-bluebadgecenter.com/how_to_reset_a_nintendo_dsi_with_parental_control0y6gb.pdfIn PDF document text
    • https://zikowetaxubof.weebly.com/uploads/1/3/4/0/134012945/fazalajabebuk_rujunatawuwo.pdfIn PDF document text
    • http://bubble1.space/ghana_police_admission_formsg5rxo.pdfIn PDF document text
    • https://nefotinabe.weebly.com/uploads/1/3/5/3/135314884/e99ede6f.pdfIn PDF document text
    • http://uscarinsurance.info/12431688600yepmi.pdfIn PDF document text
    • https://kozivusetusi.weebly.com/uploads/1/3/4/2/134234967/ramorukeboj_zogorisina_buxutewiwi_juvat.pdfIn PDF document text
    • http://sobakin.space/driver_certificado_digital_serasa_experiannhdob.pdfIn PDF document text
    • http://dfds.in/788480153356q8lp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462036/normal_5ff9d9716e8fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_9bdf37dcdc3a4a45af30dd5a18bfd859.pdf?index=trueIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_24ff1f30f26c4ff382477059265714bd.pdf?index=trueIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_4071abef835c488ab7b7902263c1e5c9.pdf?index=trueIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_d833276d742048deab84b8f9e33707c4.pdf?index=trueIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_3286167ae1a04cc98c02ef6532a00046.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_b68b90ec3939436284911ce6bd1aaa85.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_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 5444 bytes
SHA-256: 45c2be2753b7efe3b46aa22dade5ce9507ebf99985f771abe536380aa6333853
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 10460 bytes
SHA-256: 50ede87a41d2779264bf10fe99a4b081fa6eb53596041dc3f2c315e0f54dc6a4

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