Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fff901baf41cb39…

MALICIOUS

PDF

79.9 KB Created: 2021-04-26 03:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d973c188f99b023f88fd3438ac7eaaa7 SHA-1: 12aeb77dfb9eae994591a2ecffb0d9eba8d1f859 SHA-256: 3fff901baf41cb39319c5a9e86d9a327995c6e5130f6c7ec250130272f703e6a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to a product search, likely a lure to encourage clicks on the malicious links.

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://kuzutuzo.ru/strik?utm_term=remington+700+vls+308+twist+rate PDF link annotation
    • http://899themes-demo.ru/nejaxalolajers3tee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_604c98ea22576.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/ArghFhd/the_adventure_of_sharkboy_and_lavagirl_movie_download.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/kjinyZ8/crossword_puzzle_books_new_york_times.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/giving_advice_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405652/normal_5ffb7195840be.pdfIn PDF document text
    • http://tiwegopoguxuzu.mypressonline.com/xeromakiwiti.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/biodiversity_conservation_methods.pdfIn PDF document text
    • https://sikupawabur.weebly.com/uploads/1/3/4/6/134624396/6841660.pdfIn PDF document text
    • http://smeh-mif.space/vsco_x_fullpack_di_ios6hjov.pdfIn PDF document text
    • https://xanovisawedota.weebly.com/uploads/1/3/2/8/132816091/sizagalum-zeliferoz.pdfIn PDF document text
    • https://rofoxanubojinud.weebly.com/uploads/1/3/2/7/132740779/c1a3ff0edead36.pdfIn PDF document text
    • http://begimewabifax.getenjoyment.net/dabomokuw.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/jijdjj5/idle_car_factory_premium_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/1gcRzNe/the_walking_dead_new_episode_uk.pdfIn PDF document text
    • https://fibepuranes.weebly.com/uploads/1/3/4/0/134041348/pigesu.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/UiexAib/does_coffee_increase_resting_heart_rate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kadoxosin.atwebpages.com/dallas_cowboys_2020_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4336eace-1ce9-4eb0-b949-10e5a8fdd65d/how_to_treat_pimples_at_home_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3b4aa4-4940-4045-b60f-b766d3de5952/nubigerenod.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 5744 bytes
SHA-256: 80cd85a27591966fbb2bff09945941ad5251dfb7e80259d757982b9ceba890f8
font_01_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 12476 bytes
SHA-256: bc4bf2313c5dc7c4520f745246f4031aa89adcec10650e8b4aad53f9a90e79e5

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