Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ff1aa8acf4d152…

MALICIOUS

PDF

80.4 KB Created: 2021-01-08 22:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 89fdbe200830ef74928a5f1f56d367e0 SHA-1: 4a9edb0125cdf8407896354554375d75bda357cb SHA-256: 93ff1aa8acf4d15209f65c49c63ce03b28e86dd2906c561a5907bfb4b42dda4b
194 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a malicious redirector, specifically designed for phishing via SEO spam. The embedded URL, https://cctraff.ru/123?utm_term=the+lost+book+of+remedies+claude+davis, is a known malicious redirector. The ML classifier and ClamAV detection strongly support the malicious nature of this file, likely used as a lure for further compromise.

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://cctraff.ru/123?utm_term=the+lost+book+of+remedies+claude+davis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_5fe61ac837c36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_5fc07955e8ecb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482648/normal_5fcb04e469855.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/Ckghjz8/scummvm_games_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374857/normal_5ff402a0c101c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383924/normal_5fc92aade8773.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/jhijhgL/zeriju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5fcc57bd9bbe4.pdfIn PDF document text
    • https://cdn.sqhk.co/pabukerofo/rhhs7hf/intersection_controller_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/haheZDR/free_skins_and_pets_among_us_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pobixedele/59101428929.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/12666685466.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/47992809466.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 5252 bytes
SHA-256: e17c173873a58258f3be2cef354361f344ddb6c876d4cb7234a87eee36dcce84
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 11284 bytes
SHA-256: a8b440a1b2d74aa638a258f18a1e47ef64b20764d1df27648fb3a8174797a4c1
font_02_sfnt_off000125fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c