Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f9cd2c6fa8944c…

MALICIOUS

PDF

78.3 KB Created: 2021-03-29 07:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7aad27b8d468f7a1a6a0a545a7ac45f0 SHA-1: 7f5f6893311c1349fe6c0a120766802f4a19445b SHA-256: 82f9cd2c6fa8944cf15ab47adf9824015a536230f65d34f8c72fd66347bac75c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/wix?keyword=is+table+salt+renewable+resource PDF link annotation
    • http://jukojadijomefar.medianewsonline.com/57157107322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_60583d2a87c06.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/what_is_the_cost_to_do_a_dna_test_in_jamaica.pdfIn PDF document text
    • http://numulul.mygamesonline.org/lord_of_the_flies_summary_chapter_1-8.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/nationalism_in_india_by_tagore_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467927/normal_5fdfb7d8c2157.pdfIn PDF document text
    • http://fonivoguko.medianewsonline.com/belgium_train_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_a4d262c74271484597ace2382c125256.pdf?index=trueIn PDF document text
    • http://pizenusogusu.atwebpages.com/nodejs_convert_buffer_to.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/godowazakexel.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/passive_all_tenses_worksheet.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_6c0613b4906347c39bb8a2381c53ac6b.pdf?index=trueIn PDF document text
    • https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_871b79764d1d47b6b92665337b755262.pdf?index=trueIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_e905979e5e174533a6d6c13b16856a22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/32683447060.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_04ce0bcd87ec4184911c87fa9b443764.pdf?index=trueIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_eeba77b82b9e4bd6806fbdde8a0b3814.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_102b1f37e11445a6af926ceb1fff1688.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_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 4960 bytes
SHA-256: 24c73b04f9871422235d3de12b148e0b3a940a0d558b31386053aa916830d632
font_01_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 10872 bytes
SHA-256: 722da84ddcfaa2e584922c758a0cb50a0820c4d7fe4c6a8d336456fca611ddc3

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