Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef893cbe7d6be9c3…

MALICIOUS

PDF

104.7 KB Created: 2021-07-15 23:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8f0a0f426bbf011e1120f001d1e23773 SHA-1: 7e8e85a3ae39e27bf60d5d6edbbad23d20a9bbaf SHA-256: ef893cbe7d6be9c3882291ac4f2c330c1031e7593e9a70ac22c8e8d6b4ed4ddc
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a phishing and trojan threat. Heuristics reveal the presence of external URIs and a deceptive download button, suggesting a lure to download a payload. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the overall pattern points to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5608

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/~3/0YvHz_IItD0/square?utm_term=how+have+you+been+in+tagalog PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee2872b1dcdf258da658b6/1626220658631/why_do_you_want_this_position_best_answer_examples.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7d208300fd66e195a8d2/1626111264808/file_size_reducer_video.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed43fb66c2900cf55f1ad4/1626162171266/62871657599.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_off0001308d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308D 10616 bytes
SHA-256: 449600217fa7c0d21a8c59184972b08fbd4a4ee1e4b62f5bad03e364b41f7f67
font_01_sfnt_off000148bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BB 21288 bytes
SHA-256: 8c051438e365e3d2e66900fb7adbc01695ccbd1187b60a69e0aae87306a3bf4a
font_02_sfnt_off00017f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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