Malicious PDF — malware analysis report

Static analysis result for SHA-256 841779af21e45545…

MALICIOUS

PDF

75.2 KB Created: 2021-07-13 08:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8ac417351d4b5c5c0cd4d3b377214912 SHA-1: c369dafa1f63be97236179e4fc0bf1bd0cfe0cc3 SHA-256: 841779af21e45545a7b13147dcb39686c4297aaf3698f7fc6a0a28a71c6256d0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan. It contains heuristics indicating it uses an image lure for a redirector and instructs the user to execute commands via copy-pasting into a shell. While no scripts were extracted, the combination of these factors suggests the document is designed to trick the user into running malicious commands, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/qI_NY8u86tA/square?utm_term=kali+linux+hack+android+phone PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7ca8dd56f0f3612704bb7/1625803405704/average_fixed_costs.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e92730e51f1f218d6a3c75/1625892656381/dusky_skin_quotes.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec8c8e83836e7a7d617971/1626115215116/melalewapuro.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9064ae6a58043b6906ef3/1625884234710/gabrielle_union_wade.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecd1f5edb2c669a47adf32/1626132982010/segel.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61C 16396 bytes
SHA-256: 39f51efaf168297a2534a93f54575de6f4e2cd4cbb93413dc50e29520b96793f
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 10628 bytes
SHA-256: 9e87f39c7728808e6cd9a08185bdc87d4ccd132989af1563d0fb45a03d5d1110
font_02_sfnt_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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