Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca0aed5b1051f46…

MALICIOUS

PDF

84.2 KB Created: 2021-03-01 07:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a5bfc4105a035dc613cbc98a7629f254 SHA-1: 13e00bab55f4905eddf3c6a34c6d6d5af849af14 SHA-256: cca0aed5b1051f465ea5ad70ae6b6fd7135c202e409df5cd877c9bf06200c575
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate it contains a callback lure, prompting the user to call a phone number in a context related to billing or security. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or lead to further malicious content, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=wfg+business+format+system+manual PDF link annotation
    • https://cdn.sqhk.co/fumamimed/dgjoPFv/tunanuwasik.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/cJhbUgd/pizakoritepuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/jizapamilizo/hfjigdp/brawl_stars_box_opening_clashgames.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/EggtibA/sivisezemavelelebedaginup.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/tTTjio4/61364302873.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/eUNsgfq/war_of_the_worlds_series_cast_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/iii81Xk/37216334754.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/gomakobez/54230332654.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/86102099170.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/jogo_dos_cavaleiros_do_zodiaco_android.pdfIn PDF document text
    • http://zerujafulo.rf.gd/call_blocker_app_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/punctuation_exercises_for_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/bootstrap_4_templates_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/xofozogamugewima.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/cafeland_mod_apk_no_banned.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/35286144350.pdfIn PDF document text
    • http://ximajuranoda.rf.gd/the_laws_of_spirit_world_free_download.pdfIn PDF document text
    • http://malosebetu.epizy.com/sintesis_de_bases_nitrogenadas.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/performance_exhaust_manifold_gasket_set.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_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 5340 bytes
SHA-256: efdb661508d9c5e78624bbca4296632bd2352a0f3fa8d0e14f10b409afd50cc0
font_01_sfnt_off00011f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8F 10572 bytes
SHA-256: 992c0720d196e0a3077f238e0b859573c2fc88e096a8e7e11de2789bc5da8c28

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