Malicious PDF — malware analysis report

Static analysis result for SHA-256 33852773b8b648d9…

MALICIOUS

PDF

83.1 KB Created: 2021-07-22 00:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d58adc497f53876a2d8da8929c2b0e9a SHA-1: e1123735f351e69a7442b2874fb4fcabba1289e5 SHA-256: 33852773b8b648d9562eac45d7f537f71bb97f6500c362a0ec62081ba7151f2a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The presence of an embedded URI, although marked as benign, suggests an attempt to redirect the user. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure, but the overall indicators point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://feedproxy.google.com/~r/sq/ugae/~3/qQn0o4eTdIQ/square?utm_term=hoarseness+in+the+morning
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f06e467865aa574580920b/1626369606826/tusuvimunubakewomofebex.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f779ccca10327b0c9bfcaa/1626831308414/whats_the_difference_between_automatic_and_manual_transmission.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f1f072d4d27c6a5bb43274/1626468466506/61894934387.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f88f0315b3010569c643c5/1626902276101/kidal.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f8927c8c7b33121df5106d/1626903164875/first_puc_computer_science_notes.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec9889cd1a1204f6c9f359/1626118281919/harry_potter_the_triwizard_tournament.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e9332783ae0c490239b13a/1625895719905/mibidumes.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee8f6b7dee9f188f7cc431/1626247019890/jawomo.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f538d1ec5ad00cc0a65c9f/1626683602152/kefovovuvomabeduxoge.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec838edcef4a49b3aae566/1626112910727/meaning_of_adornment_in_english.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f6a6442b685a1a6c5eb404/1626777159161/kuveragixulojetakos.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ede3218f209f4d82847792/1626202913428/judiwopogavidabefu.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f88d6ad6a22c495fc4d292/1626901866472/music_tone_song.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f88f49f6b38207f733d075/1626902346274/golovexigapifewatejige.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edd5ece635d7166460d3cf/1626199532904/level_94_word_connect.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e90c34b10b9b33fa97025f/1625885748740/notexokudopetu.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f18369fe1af12ac2c77478/1626440553338/independence_is_a_universal_human_need.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f88f656c070f5bcfdb16d7/1626902373320/use_the_codon_table_to_determine_which_mrna.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f15241d1d8e65aae884056/1626427969368/exercises_with_reporting_verbs.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f05b85aa11270770019b3f/1626364805810/tuxafoz.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f6db604bd8f149757b5639/1626790752256/experimental_research_about_aloe_vera.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec9acbe0c99b3eb2d493d7/1626118860027/ship_cooling_system.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_off0000e4a1.bin
06e7219433e06b26d9c3ee199cd750a43383d3b06c7aaf50cd8dacdcde2de393		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 16576 bytes
font_01_sfnt_off00010f6e.bin
d540ec57414d940ec8ba980f8ad965afbaf753c5384e4506447cc382a541e6a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 10500 bytes
font_02_sfnt_off0001271c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 16792 bytes

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