Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ae23ad4038a81e…

MALICIOUS

PDF

80.9 KB Created: 2021-07-22 00:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f57685f16f6edf2b880870e001d1fbc0 SHA-1: f292cbfe04b9fdb8a074efc8bc543711dbd87327 SHA-256: 15ae23ad4038a81e8812c3afd205cc5630a95d154229a89d97dacd83ec98c4e1
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a callback phishing lure, prompting the user to call a phone number. While no executable scripts were extracted, the presence of external URIs and the phishing lure suggest an attempt to deceive the user into further interaction, likely leading to credential theft or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/square?utm_term=2019+population+by+race
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f27eb88c10a93e50448fe2/1626504888125/structural_analysis_hibbeler_9th_edition_solution_manual.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f34e5ce615ea111e69ac7a/1626558044554/ludotuzu.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec908790a3fc49531a5865/1626116231650/wall_and_door_same_colour.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f02d67cd1cf129e1658f3d/1626353000150/the_armory_of_wilmot.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edebd84c056a31b81cb504/1626205144338/71205270436.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9289c2c5c2f6215c9482a/1625893020364/90477625536.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e94fd32dabf2723555cdd7/1625903059868/vatixe.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed891ac1f2f61945a50b50/1626179867149/76889511934.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60efd718d77757041651f554/1626330904966/download_most_wanted_pc_full.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f061a3418af410b26c0718/1626366371445/kate_middleton_and_charlotte.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f89060bfcf5919e9538cf0/1626902624666/mount_rushmore_before_carving.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f88edc22b0bf63072a34a5/1626902236386/heartland_in_streaming.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed41e964a4563c8f7b932a/1626161641659/joxugezetobokabip.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f660dc0e346c31115778a1/1626759388317/social_security_rockville_phone_number.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f4974dc5d9e6782cef1fe8/1626642253136/8592994432.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f3f6c1860d895b482de16d/1626601153807/5823794225.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8b9c8300fd66e197278c/1626114972546/very_well_liked.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbba.bin
3000ac56ccfb6d4bccc9feaa98ef82971d021c09ba3352352c1f6449fe141ada		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 16216 bytes
font_01_sfnt_off000105c3.bin
52164f9d2775fc145012aec99d6b0c15ddf73399365385437235561b6cf3fa50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 10916 bytes
font_02_sfnt_off00011f0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0E 16792 bytes

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