Malicious PDF — malware analysis report

Static analysis result for SHA-256 c673414c10796add…

MALICIOUS

PDF

77.8 KB Created: 2021-07-12 23:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0f808b754b2f804f9e6da737a294089c SHA-1: 4996cff37a66507e7b3d18c3ca2e5559184b1e25 SHA-256: c673414c10796add95b316f629d10adf69cdeb93cf8a0818b40b34bf6b8cba9a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to a URL that appears to be part of a free download scam. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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/razvivatel/yapz/~3/AG-UZpNbJGc/square?utm_term=how+to+get+a+cat+to+love+you PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8cccb4c181567023ce574/1625869515266/leather_revolver_holster_patterns.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8c6492b8982254c497cab/1625867849249/12th_commerce_digest_download_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7d4acc976821224211da/1626111307001/contemplate_in_a_sentence.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7ba4a7d3b385c94b40833/1625799242202/what_does_cn_stand_for_in_texting.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8ce77d354a5e86a37198/1626115303463/train_sim_world_ps4_review.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8d31b1558191f5f460b15/1625871132024/drafting_and_design_for_architecture.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec9c4b4f558d0bf39e1ede/1626119243684/happy_mode_clash_of_clans.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e94e32f107ff2467ea5682/1625902642445/48552193554.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_off0000cf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF99 10300 bytes
SHA-256: ccda6c9ba2e1eae578487d0cb6f018ec4bd1a87435031056089ba932ae1b991e
font_01_sfnt_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 16884 bytes
SHA-256: 78fb50ea9c4224bd0e6f997ebac2f00de3188486a927fee24b8010ad07a9ed8e

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