Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29854a4cdc51477…

MALICIOUS

PDF

77.3 KB Created: 2021-07-19 02:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b412b17f281e30d3047850ddfafc1b9a SHA-1: 655f13b6e249ff6af733f0720cf8caa814c2e117 SHA-256: a29854a4cdc51477dde3b340163093e16c9f9dd1aafe9d8c488021905faeff46
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded URLs that likely lead to phishing content. Although no scripts were explicitly extracted, the presence of PDF_URI and EMBEDDED_URL heuristics, along with the ML detection, strongly suggests a phishing attack pattern, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/sq/ugae/~3/-7-cX3opz_8/square?utm_term=urge+meaning+in+tamil
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee82877c5bce1f3350d949/1626243719786/1254956258.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f4b104b386920ff6dbdb3c/1626648836337/participatory_monitoring_and_evaluation.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f03491bf9aec2111b1b60e/1626354834034/37776614400.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8bdb92e50bb5a73f0488c/1625865657564/mosakalevurizupol.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed979e58c2e0009560b332/1626183583060/pc_building_simulator_android_mod_apk.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f38c7322602c08caf2b182/1626573939950/537570644.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f1eefd03e0235aaf4c0eea/1626468093230/sozowivugimokiwefaxes.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee1430fb3cc800db5251b8/1626215472690/15516536976.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f25f224b68c137e6923695/1626496802398/acknowledgement_of_consumer_rights.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec886ae94d7a30e055b7f4/1626114154426/bible_quotes_for_good_morning.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_off0000cd82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 16792 bytes
font_01_sfnt_off0000e599.bin
ff077c30d99e7dc05556bbf256efb9f65216718e6b0c9e7ab65dafb596e52674
pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 10172 bytes
font_02_sfnt_off0000fc3f.bin
4b8aaa7b4ed2836daa83feb55bd4f7c07618a0ed2fc42d22faa3622a9f372901
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 17256 bytes