Malicious PDF — malware analysis report

Static analysis result for SHA-256 16733aa00e6c6430…

MALICIOUS

PDF

128.5 KB Created: 2021-02-14 08:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 656c4af16f6da8cb3584f287eafaa54e SHA-1: 48830d49da027d66ce8484dacd4391a749ef4b93 SHA-256: 16733aa00e6c643098e92c5d579a26f05dfd87ab31cf57b83ab858663994dda0
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a link farm designed to redirect users to external websites. The presence of numerous external links, including a redirector URL, suggests an attempt to obscure the final destination and potentially distribute phishing content or malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9845

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/wix?keyword=kimon+world+records+csr2 PDF link annotation
    • https://cdn.sqhk.co/foroboreb/jjDAgdb/3238877272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411218/normal_600238d33b3d0.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/9Smjbjc/31753744907.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/jijexje/vax_carpet_washer_black_friday_deals.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5fcd40e64e141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_6010f0031bb6b.pdfIn PDF document text
    • https://ziravejutit.weebly.com/uploads/1/3/0/7/130740001/4170979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485157/normal_5fd1ca5c59c68.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/iigj1jd/zafobosibexupowoligu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_5fd2ea6860968.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/japhjhe/tetris_ultimate_pc_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_6026366949d01.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/g7gfiia/angry_birds_2_movie_silver_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_5fdb12987d479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417537/normal_6006d370b24e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446388/normal_5fd1e4a472f55.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off0001db2f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1DB2F 8292 bytes
SHA-256: 16c80a75cc33d172b72516f5ba3c5ffc1ffc937a7daa536fa18e31c3f92c7da4
font_00_sfnt_off000137f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F9 6408 bytes
SHA-256: 03fe679bb333557d7496fe70f0e7f264102bf9dbddb8261362a0ce71d385dbce
font_01_sfnt_off00014793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14793 6084 bytes
SHA-256: d611063ffea7eb1f022543fcd9f0d711b5a78f77e4ece85049ace6777511d417
font_02_sfnt_off00015c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5E 6168 bytes
SHA-256: 50bd8db5ff9a0f03ea6ac0366ab4ff273dceb6ff0c6101ac0faff1fd52ccc92d
font_03_sfnt_off00016c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C00 5068 bytes
SHA-256: b3d0e5ee6ac059795c49a801d5f2ccccfbfe522b3007705150e7f3f2cdc3d29e
font_04_sfnt_off00017d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D3A 1796 bytes
SHA-256: dfab3945eace5ba27be1ad95d63d5142397767eab6bca27773794b33bda2302c
font_05_sfnt_off000185c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185C4 19508 bytes
SHA-256: 367cb761a402277e77da9930d25181d724543a59d7f6dfcd532322f3591dc354
font_06_sfnt_off0001c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C18D 17300 bytes
SHA-256: 91b4a6098d79442ae18b8207486791aa604e27c1cdd329b1d5cb10f7a854f5f9

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