Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3721b8e8c3817c6…

MALICIOUS

PDF

116.4 KB Created: 2021-04-03 22:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9c5161dd099d172229bd92536be673aa SHA-1: 2efc05c1e8f238042c5474bd49dfe45fe01ba43a SHA-256: d3721b8e8c3817c6a95c69d07b37a173f31c5218dddbf4a2c2706cd0750e3287
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, with several pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest this document is designed to redirect users to malicious sites.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/wix?keyword=gilgamesh+the+hero+pdf PDF link annotation
    • http://wagagawoduzom.iblogger.org/noma_signature_snowblower_parts.pdfIn PDF document text
    • http://pop-marketplace.ru/android_vs_apple_meme44r18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417318/normal_600f0354113cd.pdfIn PDF document text
    • http://kzrovk.xyz/takufuzejdza8.pdfIn PDF document text
    • http://cucoupon.info/869234373765loop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_602da423351b9.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/para_que_es_el_cianuro_de_potasio.pdfIn PDF document text
    • http://italystore.pro/kajixuwedrjk.pdfIn PDF document text
    • http://stankoff.org/what_are_the_rules_of_grammar67vsv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jimulopipuxofom.rf.gd/chinnamma_chilakkamma_telugu_song.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_d09b2426c4d94a869a4e5277fbe3e708.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c811278-0eba-4630-a982-2abd8321f6cb/magpul_-_ar-15_m16_sling_mount_kit_-_type_1.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_c34ae896d77a4ea59bad95b1fcb6f1b9.pdf?index=trueIn PDF document text
    • http://jadogog.epizy.com/air_pollution_control_equipment_calculations_louis_theodore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a2d325-47f3-45d7-aa86-eeb16e6bbead/buzokitok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c90815-41cf-47ed-8353-80a740c70cbc/why_would_a_mini_fridge_stop_working.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_off000184a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184A8 5488 bytes
SHA-256: 6ceebbe7074f1da5f2ec204bfc6cc716f8e70536b1e724bbc62937ab324cb314
font_01_sfnt_off0001972e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1972E 14168 bytes
SHA-256: e1ba01a361ba468c35a19e515eee63994705712eabe62a9c9bca7a697e95624f

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