Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52f33a457abfd9e…

MALICIOUS

PDF

84.2 KB Created: 2021-03-17 20:08:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2844640205a96f759993b44164d375bf SHA-1: 0c1912e856f11cf7df5c90d2132f079574e6ee24 SHA-256: c52f33a457abfd9e9e3126b6b056691bcf7db81e7101a822a6607e02f9ca8d5b
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL that directs users to a domain likely used for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to an English exercise, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/award?keyword=prefix+and+suffix+in+english+exercise+pdf PDF link annotation
    • https://cdn.sqhk.co/nojedevatas/agceWii/tinisubo.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/Iiahbih/80979180417.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxeromewime/jaeyjeT/zotobonigezabugomaxizovep.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/Qsii8gG/88176063383.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/ngehgib/gapinibadamof.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/addressing_modes_and_instruction_set_of_8051.pdfIn PDF document text
    • https://cdn.sqhk.co/bowevuva/gfgeyji/electrical_circuit_diagram_grade_6.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/5id2jfT/85173632997.pdfIn PDF document text
    • http://gopagafab.medianewsonline.com/vejaripivi.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/tajimipojimo/cricket_game_net.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/vuromezinaj.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/comparing_adjectives_and_adverbs_exercises.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/how_to_start_working_out_at_the_gym_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/probability_and_statistics_in_daily_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a709b42-c724-4a3e-9bd1-f3c1d4843b38/how_to_setup_echo_dot_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/243fbbca-8482-4401-a1eb-08365dc32ffb/best_english_learning_books.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/51007869825.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/where_is_the_lint_filter_on_a_whirlpool_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4620b47b-6c1b-421b-b189-f3b40ac00dec/91190264888.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/75258974930.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 5484 bytes
SHA-256: 58b5ba9afcd5b9b03ce8b7968657f167a5cb8872aeb480ac5aefbee1c6f10620
font_01_sfnt_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 10676 bytes
SHA-256: 217cf24e187c09cf5f80cc643069433e06aff579d9b04c21a17ff2f65a120624
font_02_sfnt_off00012e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0A 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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