Malicious PDF — malware analysis report

Static analysis result for SHA-256 b891bac1c7676d8b…

MALICIOUS

PDF

76.9 KB Created: 2021-07-14 02:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a05bb0e7fc3dfd692ead4efa6f4d2b29 SHA-1: 96db570b4d537632859d23589e4401ed37fac5b5 SHA-256: b891bac1c7676d8bfad31d548fe505a98c63b28bbcc70c6b53200fdbaa2cf9b2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to an external website, which is a common tactic for phishing or distributing further malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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://allytemp.ru/square?utm_term=our+teachers+are+dating+read+online+free
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed9b960999c45203720d74/1626184598940/complexometric_titration_introduction.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8521a63fd3b750ba3651f/1625838106783/parables_in_mark_4.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed3aae64a4563c8f7b5839/1626159790484/synthesis_of_organometallic_compounds.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e898444471185a9cdc17e1/1625856068623/how_long_does_it_take_for_slider_turtle_eggs_to_hatch.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed33c26bb85f4a8d843ce9/1626158019068/9185470912.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_off0000c98d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC98D 16792 bytes
font_01_sfnt_off0000e19f.bin
be880e3dcfc72ab39af306cf4a9445bb81d7305a5c06374a21bd5d67a365d248		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 16604 bytes
font_02_sfnt_off00010ce4.bin
5a27561e63fdbee453c114b8b26b5d02b4d8f32b0285bc589a5da61db590c24e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 10880 bytes

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