Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd99e9f993a4c704…

MALICIOUS

PDF

79.0 KB Created: 2021-07-16 03:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84d4c7b38ee0e8d98b3e41246dc1c0b4 SHA-1: 49853eac43a5c18633651c674102d4268e8f6cb1 SHA-256: dd99e9f993a4c704097510d0fa797c6cc159dacd1d9c63451d397b37870ae0c4
104 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'download button' heuristic suggests a lure to download a secondary payload. While no scripts were extracted, the overall structure and heuristics indicate a malicious intent to exploit the user's trust via a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/UQ8tT55rDuk/square?utm_term=american+dental+society+of+anesthesiology
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec8a94e94d7a30e055edd2/1626114708650/how_to_set_slide_duration_in_powerpoint.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60edf40b36d5170423629e26/1626207243302/write_the_meaning_of_the_following_words.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f05981e74ffe73c20324c5/1626364289307/1_to_1_sugar_syrup_recipe_for_bees_kg.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8a1df0f4fe1319d1515d2/1625858527775/tafanejun.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7841f0dcbb4159dd812a1/1625785375872/abuse_of_process_and_malicious_prosecution.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f058b865f7796840b410c2/1626364088538/nagikefuvidezibijovakobu.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e79f6923621b4743e0c00b/1625792361662/white_blood_cell_count_a_little_high.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e9602210ba6bce0f695e/1625876832133/individual_chicken_pot_pie_recipe_with_biscuits.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7a5d82b4c978cf40a80a/1626110557273/divisibility_rule_for_7_with_example.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e9322cdefa333328ab06a9/1625895468106/lifuwuramegubizoximikubig.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee66706d75c50a5d468663/1626236528840/kinuvasaguxowabuwedevi.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec79e2288cf71862a8934c/1626110434721/14796696124.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0a7d36d77a6456b47ec97/1626384340023/censorship_debate_pros_and_cons.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_off0000d2b3.bin
5ef0e3839818194388d39217232d742305d181bb0c8fb51d625e189ac73ebe38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 16084 bytes
font_01_sfnt_off0000fc81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 16792 bytes
font_02_sfnt_off00011498.bin
60ade6f9e6142bdafa144ff0494889e3fadb8336bb7eca93c8e3535aad584e8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 11016 bytes

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