Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdd61514403898e…

MALICIOUS

PDF

92.4 KB Created: 2021-04-17 02:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 911a8fe61937adacccd74adb15104126 SHA-1: bed0175d03a0ccb4426784fc1a40d1dbea6d3753 SHA-256: 0cdd61514403898ef16562d6fe018081f5089b3b772e7e93c097f1c6349b5860
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple heuristics indicating it is part of an SEO link farm and a phishing lure. It embeds external URIs, specifically a redirector URL that is part of a "free-download phishing" scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://gimoguvi.ru/strik?utm_term=how+to+be+a+superior+man+pdf PDF link annotation
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/79ace40821.pdfIn PDF document text
    • https://viledilexemapol.weebly.com/uploads/1/3/4/6/134698440/gazez_vufijo_sugepuvi_relirotobu.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/human_resource_management_calicut_university.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/66ade8d4-326f-484e-8cf5-84b60fd5e20f/41705930931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0bd4297-e804-4aed-9118-023db0654a4a/tableau_training_for_beginners_part_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3dade7-b166-4ee7-a637-86d3723eccdd/empleos_en_empacadoras_de_aguacate_en_uruapan.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/casio_aq-s810w_replacement_band_red.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/substance_abuse_in_south_africa_youth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a7a239-a514-4035-914f-71302f78d83b/idylis_air_purifier_iap-10-280.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/roland_tr_8_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/85806014502.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/amazon_echo_show_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/how_to_make_bolster_pillow_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/abandonei_a_gabriela_sua_musica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c83f7b2-1af7-4a77-af62-706950259f16/zoom_g1x_four_vs_g3xn.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 5232 bytes
SHA-256: eb8db3aad805fe9096fbe8454d612891f35e16c68c9e200adbf41b3e897c55e2
font_01_sfnt_off000131ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 10916 bytes
SHA-256: 92eddb51bf4c38d64db6350dbe95b755bec1d65a3e125a7ca6857a707907c39f
font_02_sfnt_off000156d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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