Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a3b0bd828c47d1…

MALICIOUS

PDF

80.9 KB Created: 2021-02-18 10:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 940cb822605d4cb5c512d5ca8ce5031a SHA-1: f432e99a3ea0e6e92df98848431ec19b66c17025 SHA-256: 64a3b0bd828c47d129d26210aa0adae7613727928820776728823f551d17aa98
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to SEO-optimized PDF hosting sites, a common tactic for distributing phishing content or malware. The primary malicious URL, 'https://leonvi.ru/strik?utm_term=do+tesla%2527s+work+in+cold+weather', is identified as a redirector, likely leading to a phishing page or a malware download. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=do+tesla%2527s+work+in+cold+weather PDF link annotation
    • http://vobigivu.22web.org/classroom_attendance_sheet.pdfIn PDF document text
    • https://woxoxoba.weebly.com/uploads/1/3/4/8/134893248/vivodopogero_nesalajumiboko.pdfIn PDF document text
    • http://rumagadoli.22web.org/yoruba_movie_alantakun.pdfIn PDF document text
    • https://gakigabop.weebly.com/uploads/1/3/1/4/131406234/mumusewogovikoja.pdfIn PDF document text
    • http://zufupetare.22web.org/meteguwolexewute.pdfIn PDF document text
    • http://takojebuti.iblogger.org/58725251944.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
    • http://xekujigifur.epizy.com/80098626743.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/53298733329.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/polowutufowarefipojena.pdfIn PDF document text
    • http://muwojes.epizy.com/create-_react-_native-_app_generate_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/42394871987.pdfIn PDF document text
    • http://musovulazapa.epizy.com/bapivupexijupub.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/isaiah_berlin_books.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/silapusajabokigexa.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/cv_template_free_mac.pdfIn PDF document text
    • http://wesukudepabu.epizy.com/59381157454.pdfIn PDF document text
    • http://zegeridibedile.rf.gd/greek_gods_family_tree_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 5004 bytes
SHA-256: 9ad97e3052f1a05da21dcef7a88096fe1564c0058256566964e92c834136de43
font_01_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 10952 bytes
SHA-256: 1528b48202e31c01d6dbc7c0682b304a2fee60ceebe6e5b9af0a819eac90cceb
font_02_sfnt_off00011199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 16600 bytes
SHA-256: 13f4bd001f4a6e0f0f5fe628b4a34667876b740911247a64d94bcbf488b41912
font_03_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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