Malicious PDF — malware analysis report

Static analysis result for SHA-256 f521a5ce4ecb41e4…

MALICIOUS

PDF

71.4 KB Created: 2021-03-16 00:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 556c39e8e732f79085c7b7c3a1efbec4 SHA-1: b714f9ae60517967c5d3d664cde6bc2fe7290a6f SHA-256: f521a5ce4ecb41e4950c13b491b2a0138b424c25dc0f0aa7d3f17b4c43c9e04f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable domains and one specifically using a UTM tracking parameter, strongly suggests a phishing or link-farming attack. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=gaggia+brera+descaling+manual PDF link annotation
    • http://vetovikaxu.mypressonline.com/protestant_amharic_bible.pdfIn PDF document text
    • http://agencymedia-ig.com/jufaxewevid6u5rt.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/heA3jeI/fajuremojujinopikigipapol.pdfIn PDF document text
    • http://honey-love.ru/into_the_abyss_song_suranx8gqo.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/hLhazQu/orcs_civil_war_steam.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/macrodactylus_mexicanus.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/38083277510.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/piano_notes_on_61_keysoxu1y.pdfIn PDF document text
    • https://cdn.sqhk.co/bugabowozi/dWHjfJf/air_traffic_control_radar_beacon_system_ppt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98d5522-a04f-44c7-909d-6f457f31ef3d/kemiwatavumofugu.pdfIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_e04c0949bfd7445c8de2cafed8b2828c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/091a1a90-1c10-4ecf-859f-2e59439243f1/zofugurubilulelim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b74d08-6f3b-48ec-8002-c416e79e8a7c/does_ahsoka_tano_come_back_in_clone_wars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16861992-3343-4776-a014-77b2d75a7785/mofetubebedibi.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/hp_photosmart_c7280_service_manual.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_b39b24bb8d1a4907acbc7a7919c80270.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e1ca6cf-5b3e-4b22-bcc3-3324c7a137c5/sozojezo.pdfIn PDF document text
    • http://vugugemo.atwebpages.com/64161928956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc55ba23-fc2e-47fd-a0fc-892cb50f2a71/how_to_clean_the_dyson_v6_animal_filter.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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 5428 bytes
SHA-256: 1666ed90d5b49efae53abb8f883c488b0ee10b2c55dce1efce046c663b060278
font_01_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 10384 bytes
SHA-256: ea6a11bfae70b854fbfb9dd1792bd0a7826dc0eebf4a5b99186bcbacf468b1e6

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