Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b7ec19561bb903…

MALICIOUS

PDF

81.9 KB Created: 2021-04-03 14:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3d4fea495c9b73cdb46c1c889fee647e SHA-1: dabcfc052c141168bb962c8ec5396fb1ba3fd41d SHA-256: 56b7ec19561bb903fbadc736e32859f6b9e2b24c33b703797f52596c2710072c
116 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link to an algorithmically-generated URL and an SEO redirector disguised as a free download. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://mezovuduw.ru/strik?utm_term=how+to+buy+songs+on+rock+band+4+ps4 PDF link annotation
    • http://funogager.22web.org/zurejoxupopajesodizo.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/fallout_shelter_mysterious_stranger_no_sound.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/principle_of_macroeconomics_7th_editqfck8.pdfIn PDF document text
    • http://suvonenexazu.mywebcommunity.org/definition_of_organizational_politics.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/76949299845.pdfIn PDF document text
    • http://itsamorem.com/48877991734r8087.pdfIn PDF document text
    • http://ropibolexi.iblogger.org/23068027654.pdfIn PDF document text
    • http://hookup681.site/followers_skyrim_trainers0lmyp.pdfIn PDF document text
    • http://tranquils.space/fumogogaruwadifeferqgi3w.pdfIn PDF document text
    • http://kunakeveguf.iblogger.org/autodesk_inventor_advanced_tutorial.pdfIn PDF document text
    • http://kitixukizogutik.mygamesonline.org/spring_framework_security_maven.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fikuvine/springer_conference_paper_latex_template.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/54588993200.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/gcse_english_informal_letter_writing_examples.pdfIn PDF document text
    • http://meziwupagev.epizy.com/advertising_and_sales_management_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/27299214751.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/morning_stretch_routine_to_increase_flexibility.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/manga_drawing_tutorial_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 5372 bytes
SHA-256: 50d2c175b6da498d519c974a8c432f3757cfc7dd12afb5f85f6ee220e592c8f0
font_01_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 10384 bytes
SHA-256: c47f01073023ef10aa049204390fb9d1daf9f39119650feef407082afb975b43
font_02_sfnt_off00012bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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