Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c73f7d0fa7ba4dc…

MALICIOUS

PDF

83.5 KB Created: 2021-07-18 20:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c6e12670e859b89d28b8935f9db9926 SHA-1: 26e4f84998f1f52e6d05e3b263e4c84f2ce91429 SHA-256: 8c73f7d0fa7ba4dcedaa5ad5f41741829923310c1e071c0cc727438985be420d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs that point to external resources, and the ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_URI and EMBEDDED_URL heuristics suggests the document is designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the overall structure and detection results point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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/razvivatel/yapz/~3/UkUWPC8UKDU/square?utm_term=how+to+set+up+two+screens+on+laptop
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee04e7895aae42f65e2a46/1626211559418/nimidatelelinuloxudubug.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f29158d9389f5e80857a55/1626509656995/hotmail_how_to_stop_spam_emails.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1731c69d231202576d165/1626436380840/unseen_passage_with_question_and_answer_for_class_9th.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e78f5328bb5f4f515ebeec/1625788243307/vaxoduxenuwose.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee0cb8ab0cb8743be0a2ad/1626213560686/80761834594.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec948a4f2b1c51afa52520/1626117258559/69809254903.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e86d35e0b7df382a7eeff8/1625845046116/61905439080.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9265337cb9044756027fc/1625892435889/34337884765.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f28dbcc4d0d61e672fb5c3/1626508732518/three_ways_in_which_carbon_dioxide_is_transported_in_the_blood.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_off0000e4bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 16792 bytes
font_01_sfnt_off0000fcd1.bin
996ccabc88dc93fdf06cc40366f53a5c99138682071315342bd848dc0023dc52
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD1 17188 bytes
font_02_sfnt_off000129f7.bin
20a1cced62c49dbec4c4e4bf493a86e2c9c5b3b8174526a9f18bd0452e1f336d
pdf-font-stream PDF embedded font (sfnt) at offset 0x129F7 10452 bytes