Malicious PDF — malware analysis report

Static analysis result for SHA-256 5097c8b1862223d7…

MALICIOUS

PDF

79.5 KB Created: 2021-03-24 19:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cba5677c07ca1cbb1e7d5013b6d19ca8 SHA-1: ca622b8807af2cf39865bc7d18dc77458d843781 SHA-256: 5097c8b1862223d7de416cfc928cacf6bd65f753e9d09e39efadeda289d6a683
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing or trojan. It contains numerous external links, many of which point to a redirector URL designed to serve SEO-optimized content, likely as a lure for users seeking free downloads. The primary malicious IOC is the redirector URL, which is used to funnel traffic to other potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=the+complete+peanuts+volume+1+pdf PDF link annotation
    • https://cdn.sqhk.co/zejegure/ujjLdSB/green_day_best_hits_offline_full_album_download.pdfIn PDF document text
    • https://rifewageza.weebly.com/uploads/1/3/5/3/135349229/dowapal.pdfIn PDF document text
    • https://zutegikovepob.weebly.com/uploads/1/3/4/0/134017150/wiwufedovotut.pdfIn PDF document text
    • http://judugasolunived.22web.org/nutone_central_vacuum_repair_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/Unghjd0/vefuwavufefatogatujexem.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/3btghBT/best_armor_enchantments_minecraft_dungeons.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/kobivimelelo/pet_sematary_2_original_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daaae36f-2586-4885-885d-2afc77419ebc/69730891432.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/13546551443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6ad796-29a3-4954-8cef-15daa76eaa5c/prefix_and_suffix_worksheets_for_grade_7_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774dd55f-69d3-4dca-8666-1de6771b134e/how_to_create_a_circular_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5333a5ee-e304-4eca-b926-209602908432/why_change_victoria_in_twilight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746321f4-3add-4a05-a2e9-eb282a43ec14/xepokoret.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7862b20e-92b2-47d7-9045-85612bdc2b0c/54682406624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c56ffed3-6e7b-4862-96ad-753dd50782f3/batman_the_killing_joke_full_movie_download_1080p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91862fb1-4897-4763-b1df-dfe8d658918c/71152978434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2a2e7b-53d0-417d-a753-4a92c75d474d/92612182112.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/formato_plan_de_negocios_fondo_emprender_word.pdfIn PDF document text
    • http://bilitejevi.rf.gd/6th_grade_adding_decimals_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/99354943469.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/3050961696.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_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 5360 bytes
SHA-256: d83a27e829a68088e5dffd28332a165627791e0335307f865da566bb3acc78cb
font_01_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 11468 bytes
SHA-256: 3bb6dd8488118aa26452e137827b23417d10f96a06ffe5a70c8004bd386ecb5e