Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb97e33b4b9aaef…

MALICIOUS

PDF

78.6 KB Created: 2021-04-21 10:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2b207b22dd843c10c7fe8dd09dfd2127 SHA-1: cc528d3cf0a65eb6a5770eba8f5a23b48c72d552 SHA-256: 3fb97e33b4b9aaef6a8b0f264ea015552fe423714e1c6893a968287f64332888
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an external URI and an SEO redirector link pointing to a URL that appears to be part of a phishing campaign, likely intended to trick users into downloading further malicious content. The document body is heavily obfuscated and unreadable, but the presence of redirector links and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/strik?utm_term=stephen+king+pet+sematary+book+plot PDF link annotation
    • http://seomagnat1.online/22688013643y2z3e.pdfIn PDF document text
    • http://businesshelpservice.com/bakobupakolagap982je.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/ifhhie1/fojoretelirezixamawej.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/najipazipi.pdfIn PDF document text
    • http://copyrightproblem.com/fce_practice_test_1_answers_201586ncn.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/zubijux.pdfIn PDF document text
    • http://shopee24.site/garmin_approach_s60_helpb5z7e.pdfIn PDF document text
    • http://theharaka.online/4690098846yjd32.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/ihfPhdi/16078628482.pdfIn PDF document text
    • http://devlp.design/51532109335sgx6j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/julaxel/24685776702.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/35536647993.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/61122199674.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/100_verbos_en_ingles_y_espaol_regulares.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/81056348058.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/what_qualification_for_indian_navy.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/tejesafuta.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_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 5640 bytes
SHA-256: 261702c8527c90cef753c35f5ab0b7d151d60a202b414883390568345e696d4b
font_01_sfnt_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 10956 bytes
SHA-256: 2397feeef02332bcd36ee589f80a6838857408ffdf79c4f56732ede9f96f11c1

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