Malicious PDF — malware analysis report

Static analysis result for SHA-256 815909571a08adca…

MALICIOUS

PDF

68.0 KB Created: 2021-03-17 09:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2f14adc933c3f2cb01f245b82584d2bc SHA-1: aed0e6af59f2406c17e830d0afa15f5103018368 SHA-256: 815909571a08adcaf70c7b86fea9899dc4ade4a641d60ac70e794f5e55c2e450
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the document is designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/wix?keyword=the+jilting+of+granny+weatherall+quiz+answers PDF link annotation
    • http://nubidatum.22web.org/the_missing_cast_members.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_60106bb48e5a1.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/9dhjgdC/fursuit_feet_paws_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_6032852d443a1.pdfIn PDF document text
    • http://bestcreditcheck.info/how_to_reset_verizon_kyocera_flip_phone7w7kb.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/jciggcO/ww2_aircraft_names.pdfIn PDF document text
    • http://dlkmvkoenv.info/rurujojenesukifevijogugiow89z.pdfIn PDF document text
    • http://crysety.xyz/accounting_information_systems_specialist_salaryp35cr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_6046f744c35c6.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/the_amory_wars_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_600f9fb90ca86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jarepumemaxi.onlinewebshop.net/bioaccumulation_factor.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/excel_spreadsheet_for_inventory_list.pdfIn PDF document text
    • http://tebimanapedupun.epizy.com/yokogawa_centum_vp_training_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/phrasal_verbs_worksheet_esl.pdfIn PDF document text
    • http://fezivadijar.rf.gd/bachelor_of_science_in_business_information_technology.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/sherlock_holmes_benedict_cumberbatch_series.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/what_is_the_meaning_of_the_little_prince_movie.pdfIn PDF document text
    • http://robefowoved.onlinewebshop.net/2108769603.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_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 5424 bytes
SHA-256: a22fca9e3793cb4208ffa60138dc3c2d4d5c7c99c817faea16ca6d11d8f207d9
font_01_sfnt_off0000de88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 10072 bytes
SHA-256: edc9e6fc2d61597bac6693c4dc5d99881239c708533667de3ed14c59d5481ca3

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