Malicious PDF — malware analysis report

Static analysis result for SHA-256 13800c76d4e41acb…

MALICIOUS

PDF

76.5 KB Created: 2021-01-31 21:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: a6cb88f180e6d43e0654c2a58259b940 SHA-1: ab2320608537471fe4cb3032aa654aa05ae3dcfa SHA-256: 13800c76d4e41acbc458930bdfa4bdc0e5a8f205a93a6b9fd0473f6b8f324150
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, identified by multiple heuristics as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download a second-stage payload. No scripts were extracted, but the primary attack vector appears to be the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=health+privilege+activity In PDF document text
    • https://static.s123-cdn-static.com/uploads/4370985/normal_5fe5c3a7a9671.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490516/normal_5fde0dc08559f.pdfIn PDF document text
    • http://mushygushysayings.com/88352344924zl4f7.pdfIn PDF document text
    • http://lamovingcompany.com/amazon_fire_tv_photo_apptwvuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385862/normal_5ff384d38ab25.pdfIn PDF document text
    • http://zdsshop.top/makalah_cephalgia1jmct.pdfIn PDF document text
    • http://hisgohar.site/dead_zombie_shooting_target_zombie_games_3d_apk6xnmh.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/kotenu/21545204342.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/english_sentences_for_beginners.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/traduction_cahier_de_recette_informatique.pdfIn PDF document text
    • http://maweriza.epizy.com/melbourne_formal_dress_shops.pdfIn PDF document text
    • http://bipedok.epizy.com/letasoft_sound_booster_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/faleki.pdfIn PDF document text
    • http://sumojoripira.rf.gd/tudufefisivakawadanat.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/75860451865.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/sefijixatiweriz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 5140 bytes
SHA-256: dad8005f3da23ae0a8b52143eb81074a67b5eee5cc013926a457e98e895e1979
font_01_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 10468 bytes
SHA-256: f1ec672481ec880860012527cfba924f43b5c51792db5dcdb7da07fd2ab18e5b

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