Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c07fb24056ee77f…

MALICIOUS

PDF

84.3 KB Created: 2021-03-14 15:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 309b65a740fe99757d83965b08b27117 SHA-1: eb778d5e1d1ceefbf7e1b1f54b55a54ad36527a4 SHA-256: 7c07fb24056ee77f855f3cb08f5d9b8f8cc338640958d995253f78353b9c4c30
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers as malicious. One heuristic specifically identifies it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and the ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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/strik?utm_term=ed+sikov+film+studies+an+introduction+pdf PDF link annotation
    • http://mafejaruvoje.sportsontheweb.net/what_is_power_and_politics_in_organizations.pdfIn PDF document text
    • http://indonesia2health.online/adverb_of_time_place_and_manner_worksheetsbs2dk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_60466852e728e.pdfIn PDF document text
    • http://mini-cam-v2.club/basic_electrical_calculations_formulasdnh6r.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/koxoluritawebisul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444092/normal_604d9cb75204d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403688/normal_60317431bb939.pdfIn PDF document text
    • http://laxana.ru/donofubinamikopixapiauspx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_5fd68cfe9e124.pdfIn PDF document text
    • http://netewe5.xyz/how_to_remove_rust_from_weber_grill_grates1lekv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415767/normal_5fca2c26d4930.pdfIn PDF document text
    • http://afracheat6.xyz/28364783214d89hy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_601abb194d3f8.pdfIn PDF document text
    • http://manybigs.space/inservice_training_letters_templatesueiua.pdfIn PDF document text
    • http://semengergel.ru/pets_mod_for_minecraft_pe_lucky_blockg503b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5fe2927249819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_60262413438d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/twitter_iphone_video.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/pogodezutovamodexu.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/bose_sounddock_portable_battery_life.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001188a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1188A 24436 bytes
SHA-256: 01a50403c2007f1f7a4e9e8ac30c9fb845f150f57df9661dc84ef53f4c0fad48
font_00_sfnt_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 5380 bytes
SHA-256: 7dd7f7fd22d197d9826607135b73acc9eb2ececa0ea0ee88127bbf223e388f98
font_01_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 10988 bytes
SHA-256: edefb98283c462eb2ab2f4514a470fec97ab78cb0eef2db389bbedc6e2eb5aba

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