Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae88be75d20d762c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-01 07:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b676d174aed0e784e97bfbf13eeb6912 SHA-1: b0c5df738d77fd89b128e63988e4cf6cf7e09867 SHA-256: ae88be75d20d762c0af4d2ef7cac014d854ecc170a54bc25f47aee883e0bad04
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The primary lure URL, 'https://lozipotod.ru/123?utm_term=romeo+and+juliet+act+1+scene+5+study+guide+answers', is presented as a study guide answer key, a common phishing pretext. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/123?utm_term=romeo+and+juliet+act+1+scene+5+study+guide+answers PDF link annotation
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/6168dc19424922.pdfIn PDF document text
    • http://astrology-personal.online/class_9_physics_work_and_energy_questions6s3ht.pdfIn PDF document text
    • https://kinenuxoj.weebly.com/uploads/1/3/6/0/136050389/sigezozosa.pdfIn PDF document text
    • https://moxuzoketo.weebly.com/uploads/1/3/1/1/131164531/3803767.pdfIn PDF document text
    • https://rugalasaludazi.weebly.com/uploads/1/3/4/6/134683923/moxuxovik.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujinul/ecShige/cara_beli_pulsa_telkomsel_m_banking_bca.pdfIn PDF document text
    • http://lbaranaydin.com/81663543796b82no.pdfIn PDF document text
    • https://garupiripo.weebly.com/uploads/1/3/4/3/134386314/liropazivuv.pdfIn PDF document text
    • http://itclick.pro/54111096017xjewk.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/xomepixo/keto_diet_shopping_list_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/show_list_of_sheets_in_excel.pdfIn PDF document text
    • http://zulifozomitolos.rf.gd/professional_handbook_of_architectural_working_drawings.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/bible_trivia_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/how_do_i_contact_wahl.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/guteribeluvadenutugu.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_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 5712 bytes
SHA-256: 756a5f67985c87ecdc32800abcbac922dfb7d3927af474ca5ec2e2fb3b6f3175
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 10196 bytes
SHA-256: a07317b4b3c92c1b112559e428e7012d2328d2a8d3a54bb9a6fae0e471e911bf