Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf3717ea9f01594…

MALICIOUS

PDF

68.0 KB Created: 2020-12-17 09:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 57bbbdd358f89059fa8a58e69185649d SHA-1: e9273ed4b022dbaadddd4bb5d393f0ea0f7f068a SHA-256: 7cf3717ea9f01594d2d90cc2fd760692287b351e0c6c18fd6a6c0409d61ad9bb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, disguised with a search query parameter suggesting a lure for free content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing. Although no scripts were extracted, the presence of a malicious URL is a high-confidence indicator of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=lotro+minstrel+guide+2019 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc00a03c6229360eca839ab/t/5fc15ec0e18c5c478e2f350b/1606508226027/straight_talk_phones_black_friday_at_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68663c59-cf90-44f9-b4ef-ae495e32b60a/tonave.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/obd_diagnostic_software_for_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f73d1c8c741314321d77/t/5fc300665147b148049619e1/1606615143128/97455440426.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/50670705757.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7820a04a8c57c148abc30/t/5fd6a81be5ac5828962d26d7/1607903259963/kerurofupavuxamezukeg.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c4adc89e1c4b8fdffd23/t/5fd6e56ede5b1220c03e4353/1607918972283/63250763859.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc115d62bbd7406580792b0/t/5fc1f3053485235c860c8d01/1606546182206/vba_subscript_out_of_range_activate_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0101045e-ec15-423b-acae-9b3ae5d60eb9/microcontroller_at89c52.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/lcaf_payroll_services.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce6232e5a13e2fea70f5ba/t/5fd21bfac10336458b3e8eee/1607605244188/91666283451.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD69 5360 bytes
SHA-256: dd1add2a178b05e7ceed5dd2882cb99cba7c9e8b0a18bf09e9dbb2577ab1ba3b
font_01_sfnt_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 10532 bytes
SHA-256: 92250cb25ad8497864e9ca8c891e2a04f4c44d0789618bb8936f81a417ffe1ee