Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d9b959ceaba825…

MALICIOUS

PDF

67.7 KB Created: 2021-01-06 09:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 68c5d1f792a370e10ebb2fbe1ab5f275 SHA-1: d1265ad4668d3601cefa5d1f2883d9cd802384ba SHA-256: 28d9b959ceaba825afcd1aabe135d6db6d23eb44328dedd9d7a4874b0ccc16c6
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is classified as malicious due to its structure, which includes a mass of external links disguised as SEO content. The primary lure appears to be related to 'the voice performance', directing users to a redirector URL. The presence of numerous PDF links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafficel.ru/aws?utm_term=all+of+me+the+voice+performance PDF link annotation
    • https://cdn.sqhk.co/sezogitov/gheKgcK/vozesugefasegeki.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/964167726e.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/e8gg6UR/phoenix_suns_players_all_time.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/zozobuwo_gutetirabaruja.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/hg6UgeA/dreamer_lyrics_martin_garrix.pdfIn PDF document text
    • https://cdn.sqhk.co/lojiwoxaz/dicwgdh/90600596778.pdfIn PDF document text
    • https://vizupadugixodu.weebly.com/uploads/1/3/0/8/130813134/f563f88d7d94.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/w4ngfXb/pokemon_showdown_team_builder_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dufadafakuti/hfuhf5r/golden_farm_idle_farming_adventure_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/heNjiZw/video_meme_creator_app_for_pc.pdfIn PDF document text
    • https://batagokefo.weebly.com/uploads/1/3/1/0/131070859/8613290.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ab19d16-ff8a-458a-b370-5c6acae65747/25215099653.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 5124 bytes
SHA-256: 4624479275c4b539f6d981222d376f85f3aa48a344d19e0c6e3f4daf56489ffb
font_01_sfnt_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 10908 bytes
SHA-256: ec816934cc4838b7e7ae566dac576cc47fb2d892505fd47e3900023b1a3087bb

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