Malicious PDF — malware analysis report

Static analysis result for SHA-256 5625261876d5bfa0…

MALICIOUS

PDF

71.5 KB Created: 2021-03-09 10:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5a9d0077333ce58a11471b20ae53e008 SHA-1: 086dfad93966efad86f7e662ed712523c43d7c0d SHA-256: 5625261876d5bfa0e3a42d213def880b7617f44e78818c70fcc4065f8abee043
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to PDF files hosted on link farm domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate a strong intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://kuzutuzo.ru/wb?keyword=can PDF link annotation
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/xupofawiru.pdfIn PDF document text
    • https://sotumeramevoma.weebly.com/uploads/1/3/0/9/130969712/borutitapixizagudil.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/aOchiia/how_to_use_hopper_in_minecraft_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/UvieuPw/agricultural_shredder_machine_for_sale_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/EjeNjhF/13963848988.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/ghhiG5K/fomobaviw.pdfIn PDF document text
    • https://felomavemupej.weebly.com/uploads/1/3/4/5/134583365/fb74d2fe10.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/504969.pdfIn PDF document text
    • http://instahelpforbusiness.com/50320675024dblur.pdfIn PDF document text
    • https://cdn.sqhk.co/tinawegu/14Hjeid/crude_oil_price_news_today_reuters.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/hgiakSc/electric_hammer_drill_harbor_freight.pdfIn PDF document text
    • http://top-shop-store.website/xadofobivanzcqk.pdfIn PDF document text
    • https://wafukereloxajof.weebly.com/uploads/1/3/5/3/135311523/30e975f1fd255.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/chgEhbp/tubing_near_me_helen.pdfIn PDF document text
    • http://nebo-baikala.ru/vasogawasobuvumiwokmlhb6.pdfIn PDF document text
    • https://cdn.sqhk.co/bewiviki/g0Siafx/android_gradle_bundlerelease.pdfIn PDF document text
    • https://jokikisiva.weebly.com/uploads/1/3/0/8/130873994/xegugalizumanilapej.pdfIn PDF document text
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/mububakamiz_fifar.pdfIn PDF document text
    • https://cdn.sqhk.co/gobopovupav/7Qifehg/zulabixili.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/mexivetusulazez-xotem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe0971a-7810-4546-8085-b3bd70be9eee/72766093585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5687a48f-dc6d-45e8-a3b2-5f5534521bc9/dudutamabibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5338fa-fd50-4289-8674-d16aefe63cac/bedirakedon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac847ed-98d9-4229-8f75-beacf8ab0e68/bidiniruwisaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc8d8c5-9ea5-41a6-aa17-2396ee075612/left_side_of_the_brain_functions_stroke.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_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 5072 bytes
SHA-256: 109811dfd7b2ece0329acc28247a83bad1e6bfc6b6f5d37af518b0ef9511d415
font_01_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 10176 bytes
SHA-256: 10faf723103e857ac13b99e1a1fa59391b33b131d028c978d5c7eab301c9b3b4

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