Malicious PDF — malware analysis report

Static analysis result for SHA-256 938ebc53e3b3f4ac…

MALICIOUS

PDF

84.9 KB Created: 2021-07-22 02:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a0fd0224b5e3c974f1c5672a5bc8ccb SHA-1: 54320df11648e27c15a6b52338cdcb320386b96f SHA-256: 938ebc53e3b3f4ac6681249b45810c8b5399494ee8208b806dfa1427e0f0526b
96 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or exploit delivery mechanism. The file's structure and heuristic firings point towards exploitation of a PDF vulnerability to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/aauXj3bnHUA/square?utm_term=the+function+of+the+pampiniform+plexus+of+veins+is+to
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee33ea0981f36585a164c2/1626223595035/blond_and_copper_highlights.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f3f2f7d9389f5e8093fc88/1626600183749/articling_student_at_law.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edc705ba7c7f743c1ac7aa/1626195717727/plural_of_nouns_exercises_multiple_choice.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f44692d68f322590629315/1626621587052/how_long_does_running_a_red_light_stay_on_your_record.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f087e09c340534893c07f8/1626376160601/rakekebijupizemusagijos.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f843f412db3d6e375c3698/1626883060452/llewellin_setter_hunting.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f2182d2e59700d3e510059/1626478637115/yunexpress_track_package.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f8adfbfec7cc27b4c153f9/1626910203922/lagofemajuxiju.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f688c61cd2fa688774e4b2/1626769606956/38757658459.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e95aa52f3c4128e18c1140/1625905829676/advanced_english_in_use_2_photocopiable.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee967d07d0587a3767a6f5/1626248829712/tamil_bluray_songs.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f01f9ab37dc55b03518a7e/1626349466907/43613265480.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f52832a3156f43f34813e0/1626679346752/91472798690.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f3233eec5ad00cc08da82b/1626547006733/days_out_ayrshire.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60efd18bd052060b21f52ba7/1626329483580/philips_home_lighting_catalogue.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f5e3bfad5ab52167f7bebe/1626727360012/area_of_triangle_example.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e94689b67368755968d8fd/1625900681920/jesus_christ_god_and_the_holy_spirit.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f7f1331ea6a807ba84900c/1626861875629/interest_rate_yield_curve.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e95dafb10b9b33fa9978ff/1625906607157/what_is_the_unit_for_magnitude_in_physics.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e80767d0799e4214c219e7/1625818983229/tafexominobivad.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee3d79aa539923b5866dfe/1626226041435/fitunazexopan.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f8745b12db3d6e37612802/1626895451999/getifadarexol.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f5a179e9756f21e83e144c/1626710393440/itchy_inside_vag.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f85c1fbd6002733acbec49/1626889247211/mepeduwu.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_off0000edcb.bin
324720145afee2139a78db9d6584bb33c3df86217acaabc48a6aa071ae3b72aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 10976 bytes
font_01_sfnt_off0001071c.bin
1a16d78213375011958291d88045e97626bb4cd605c27c3fbd8d77ba8fea1663
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 15004 bytes
font_02_sfnt_off00012d20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D20 16792 bytes