Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ad1e787d94b41f…

MALICIOUS

PDF

185.8 KB Created: 2021-02-25 05:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 0f556dcafddf0f9860b228100fc97a61 SHA-1: a991083d4d0962542465adbe678ed3218c928837 SHA-256: c3ad1e787d94b41f4ee57bf73c7fded26727f4e5cc4f5635728d1545fae749eb
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://yafferge.ru/123?utm_term=what+genes+are+on+chromosome+3', is identified as a lure for free downloads, typical of phishing campaigns. While no scripts were explicitly extracted, the PDF structure and the nature of the redirector suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=what+genes+are+on+chromosome+3 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcbf99260c26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422134/normal_5fe4865f3340d.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/Ljf6ieq/big_screen_phone_for_seniors.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/bqiiJib/rujedeseg.pdfIn PDF document text
    • https://cdn.sqhk.co/rowojazur/iP8hibh/age_of_myth_genesis_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/nogegamapagi/ijdYtyr/52588245092.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/PhjIxdm/65142086942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468274/normal_60071f520a618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5ff6521633a52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475875/normal_60026e88b57f7.pdfIn PDF document text
    • https://cdn.sqhk.co/rokijatu/yigtQw1/17458293190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dujepav/camellia_pruning_tree_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/xofunotavatazofimag.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/buxusuravositux.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/41162143551.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/jolaboxepe.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0002a489.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A489 30280 bytes
SHA-256: 88f9ba48fd8c3b04923a7d0619148acdc452f81a0275c8c685e2d79ae5ccaa4b
font_00_sfnt_off00026f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26F3A 5360 bytes
SHA-256: 99a0dffdee7f00bc51b0a67586f2360077f8cd49edf62d77fcf01d754f92c9e1
font_01_sfnt_off00028159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28159 10284 bytes
SHA-256: 996d1c8b5cbcc806e1308ebcd396358757ab2c40aab8193162a8f697fa4ef93d

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