Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81b8633808cc24d…

MALICIOUS

PDF

82.7 KB Created: 2021-07-12 20:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d084b8fa54022ca68dcc150a8f3e1aa1 SHA-1: 82a912661b7d78b7f99b14b1f0c27d0ac3d64fa1 SHA-256: e81b8633808cc24d8f4e7a5d3d3fc1ffb39c143527d4bd4389ea5537a3a42a91
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to trick the user into visiting a malicious site. No scripts were extracted, but the presence of the malicious URL is a strong indicator of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://queure.ru/square?utm_term=the+hobbit+chapter+14+questions+and+answers
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec76904c0b954f9ea2ecb4/1626109585038/professional_ethics_multiple_choice_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e926b3e370ac632289276e/1625892531173/12920123985.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec78c95978cb5ccaa9b798/1626110153550/data_structures_and_algorithms_aho.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec792fb8cbe518df56dc9e/1626110255578/anemia_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8280280504e0a776cd45a/1625827330785/67989991338.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e93dd7320dbd0de281faa6/1625898455381/check_my_laptop_battery_health.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e89229dad5c55fab73ab1a/1625854505324/funinezujumonedage.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec77f9a1f8f93f64aa9ad3/1626109945119/5882507229.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e940af085b1c120f992eac/1625899183696/at_your_feet.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec76ae31b0b43e07e587b8/1626109614872/xibidokipotajofoxipewuj.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_off0000dff1.bin
49850085f98617ac5c5af76d3f14ca699b4486682e984f6411a90d9c908d63b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 16684 bytes
font_01_sfnt_off00010af1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 16792 bytes
font_02_sfnt_off00012308.bin
7cbb8a8de60f0986b822186e2f49a95bbc8fce408f4b253a4817f9097ac702ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 11128 bytes