Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84634495ea4d660…

MALICIOUS

PDF

88.9 KB Created: 2021-07-22 00:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3ebe573b47f865fefb02d3d9822f3663 SHA-1: 65f448acdc92babe9542706a8e186a26825dfcef SHA-256: c84634495ea4d6607038082d62ee9923e4ad9f1acdb874b471f5b1f2130399bf
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and a phishing attempt. The presence of a redirector link, identified as an 'Image lure linking to an SEO redirector (free-download phishing)', strongly suggests a social engineering tactic to trick users into visiting a potentially harmful external site. No scripts were extracted, but the PDF structure itself facilitated the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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/ZV5PD9BTPXI/square?utm_term=sims+bustin+out+gamecube+iso PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8a89a9a0fc52ea42766fb/1625860251270/bent_meaning_in_malay.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f45b97db752c5e49b608bc/1626626967870/wekejizomazezowumon.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f8900a6c04540b03072224/1626902539013/lujamuperamubebageku.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f5655122602c08ca088c95/1626694994028/2400901915.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f687b70e346c3111591d9c/1626769336240/sinalefutok.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed64b1b1b13d3c3c10df1e/1626170545959/79946495225.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eca9413080d76c7a547c83/1626122562014/kigezenejagir.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f852fc0d68c804f576354b/1626886908526/what_are_the_features_of_expository_text.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f74859f2d316216900ac79/1626818649435/laxob.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecb791ac3b542cd9b1c308/1626126225983/another_word_for_meander.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e820b5f4d7c53d8b15ff7a/1625825461099/clustering_in_ai.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f88fed1c69b90b7a7a6af7/1626902509605/naridisezovajurefagata.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f7e1e2f307916d7de33e95/1626857954735/subetojol.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f72712aaac8b6e869b8221/1626810130441/kosawujarulax.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f812abdf42ba2c7ad9cf28/1626870444064/stan_murray_shelter.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f88bf67ab20d5686b29b25/1626901494812/meaning_of_loose_cannon.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7f6af89f8e700bf6f738/1626111851076/best_of_the_grinch.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 17668 bytes
SHA-256: d6ad5757db5fc93b1c165aa20625814287c6fe3f6b03ebe2357c84c8379ddce4
font_01_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC5 10740 bytes
SHA-256: 78f61b29657bd3b59419dfea868a135a3b6242db8becf443e3f8b29a44343a85