Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae508b96095885d5…

MALICIOUS

PDF

69.8 KB Created: 2021-01-10 01:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 94f69872e184043c618f71cf8bd51807 SHA-1: a615d32fe4cab9fb935c02708967cea0b69ede85 SHA-256: ae508b96095885d57781642b4cbabef460a6f2f0999e1c1d9b3c0014e275c7f5
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm designed to obscure the true destination of a phishing lure. The primary URL, 'https://trafffe.ru/aws?utm_term=ctet+answer+key+paper+1+set+k', suggests a phishing attempt disguised as an answer key. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/aws?utm_term=ctet+answer+key+paper+1+set+k PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465133/normal_5fcb44d05accf.pdfIn PDF document text
    • https://site-1178518.mozfiles.com/files/1178518/97687197118.pdfIn PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/gisegutibakasetajipi.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/5590785.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/675b4e85caa16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/xirixepo/bittorrent_latest_version_free_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/letter_i_worksheets_for_preschool_free.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/80620394045.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/siwumisu.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/estee_lauder_double_wear_shade_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/5264697478.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/tugezovaragogabi.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_off0000c24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24C 4996 bytes
SHA-256: aa8ce1896704801ec5b1fb951ed7073fab0bc607af2919d4612c7fdcb4b5404c
font_01_sfnt_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 10612 bytes
SHA-256: 7381d375292b24fe64424cac230eff1f8b3bea9786ffcb471bb4dd1640fec118
font_02_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 5040 bytes
SHA-256: e6f3ea6ae080dc58d4f193e888e2092623dc931b1b3796fac83d866dd32e2f10

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