Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b7874f4e63fb95…

MALICIOUS

PDF

125.4 KB Created: 2021-01-25 23:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 1c2cfa275487ef0e2696bd121657b247 SHA-1: 4b24f19476d3809bc2012f330b15681a800970e4 SHA-256: 65b7874f4e63fb9549920f8389a8704bb80aeedcd543564eb98e255d49de64d7
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though obfuscated, contains text related to 'spring constant' and is likely a lure for a phishing or scam campaign. The presence of numerous external PDF links further suggests a link farm or SEO manipulation tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://traffking.ru/123?utm_term=what+is+the+spring+constant In PDF document text
    • https://bebojeraje.weebly.com/uploads/1/3/5/3/135302211/peratoroduxoxodegu.pdfIn PDF document text
    • http://talezoruvaje.iblogger.org/checkbox_bootstrap_4_template.pdfIn PDF document text
    • https://puxupukesif.weebly.com/uploads/1/3/0/8/130813524/jererarizetadak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459328/normal_5fe6e19fae4f5.pdfIn PDF document text
    • https://jabikazisejifo.weebly.com/uploads/1/3/1/6/131606509/gifimuza-fivosusub-pefokigitir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492240/normal_5fe4abf8cff4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_600df73f5ba9e.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/nolarifaforuxop/62709030874.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/guputumasufufi.pdfIn PDF document text
    • http://givemuzod.epizy.com/pupiv.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/nozakutogigovemenasusaf.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/pixokadaxojixixikexuvov.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/95155470713.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/ullathai_allitha_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/been_vs_gone_worksheet.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
    • 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_off00018f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F11 5176 bytes
SHA-256: f2d211e592e69e4b3e4d8fcd6d6789934f59274f25ea6a61b1ed2ca37ec08d90
font_01_sfnt_off0001a0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0B6 15104 bytes
SHA-256: ac2b095f1de08d47b4e65d53ea13c42b9c9e9a7a7766adf6f74857a419694fed
font_02_sfnt_off0001d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1E2 16500 bytes
SHA-256: 2593df3a16d8c14ab970b57f2f195f3aa8fbe3f0db1b858b1784243bb3338a2e

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