Malicious PDF — malware analysis report

Static analysis result for SHA-256 82941736296959f6…

MALICIOUS

PDF

49.5 KB Created: 2020-11-06 04:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5958420e9ffb6be9a24ef17202b77078 SHA-1: 1e75fbbeac3de1e8038d63975a2c53661f96f628 SHA-256: 82941736296959f68cd8ba834f93b45fd35b967e69131fca43c1cbba494a981d
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure. The document body, though heavily obfuscated, includes the same URL, suggesting an attempt to lure users to a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://traffking.ru/aws?keyword=que+es+una+maquina+termica In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f9dcad88f453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_5fa29a043e7fd.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/be7daea2-42b8-403f-820d-60bfe67a3f44/pizukutekamide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e391121-2828-4491-9fbd-66ed0eed54e2/9480914817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d68bbb86-3529-4139-b9d6-787c84ea2802/kakalowotur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c76f8b-11a4-4c17-8ba6-dad97d8bdcd8/xirivaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052431f2-7c7a-4e9a-b72a-2c603417f270/capital_theatre_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de21da45-18a5-4298-961d-cdf6fd2a2fc1/publix_preschool_pals_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22717d30-8dd3-4706-9d93-dd09fb43528f/vabowodolibivaresuxuzixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf3a9448-9d01-4e4c-b68b-18cf5a860143/names_and_formulas_of_compounds_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13364eec-ff3a-4b7d-9f34-b61529a25d1f/jixemisijazozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd9db03-a8c0-48dd-a8ec-86782ca113f8/tugorasoxamez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac0fe53e-611a-47ff-9458-57f9bca38dda/friedel_craft_alkylation_of_benzene.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/basic_english_words_with_meaning_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/la_vritable_histoire_des_bilderbergers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db624af5-9844-4af4-b369-be674ab7ae76/tabitebovu.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 3

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_off000080dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80DC 5100 bytes
SHA-256: 4d42ad6e0b00bed7a7f43d16f22615871584b0b52c5e8af964691a024a632283
font_01_sfnt_off00009221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9221 11616 bytes
SHA-256: 5c066050f0a782c289b3f9a57fe524d3d5a860fe988364cc50489054c8a0b8f0

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