Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d442d395c486a9…

MALICIOUS

PDF

85.7 KB Created: 2021-03-24 22:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5d059833c3ced1e14ea12104d8cdec2f SHA-1: df27558c3b6f736db0b8d502ca5428a8e6cad42c SHA-256: d9d442d395c486a9016471e1a0c570a4cf01f46da621e245547e3045a88d6682
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to 'best plays vs 2-3 zone' which is likely a lure to direct users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=best+plays+vs+2-3+zone PDF link annotation
    • http://cafechorsu.ru/86651630339re9o9.pdfIn PDF document text
    • http://ruszaimclub.ru/asus_x510ur_manualqjvvi.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/punctuation_exercises_for_class_8.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/daily_words_app.pdfIn PDF document text
    • http://cmbespaceclient.xyz/69133821026c437k.pdfIn PDF document text
    • http://sberpodarok2020.online/tipupakogivonorugukakalu18z9o.pdfIn PDF document text
    • http://vamoktin.ru/android_studio_video_call_tutorialohc9m.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/learn_how_to_do_currency_trading.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_602fd82f31c06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454049/normal_60079bb4f0528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459636/normal_5ff15e7273357.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/tofizo/xuvigejisinove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e002dda3-e2a5-42b4-813a-15a8fa72a548/which_of_the_following_countries_has_the_largest_economy_in_asean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83be03aa-d27a-415b-bae2-6777e9cad79b/can_you_refuse_to_answer_questions_in_a_deposition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537393dc-75cd-4044-908c-d6aa16faa223/54766152184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/949ab42d-c32d-48cc-a936-3ec73ab0b12e/what_are_the_fitness_requirements_for_the_navy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf60645-0790-4827-9ef1-88638a635fcc/xaduremuwuvezifadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58da74d-bc2c-410e-92c6-e03fa92e40e6/kesopitepositamabomebepu.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/close_reading_passages_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/tozerazatuwujufajorap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c9596d-d5a9-486a-8657-2ec9b1d67f5f/28137852565.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_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 5308 bytes
SHA-256: 72df845d44776ba832678b8a6cb83c36e0dc78638e01a237d8ad77391ff49397
font_01_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 10864 bytes
SHA-256: 891eaa9f43a3b9d8273d8c299309f316304b5acf2c0b9cae7e2773431b21c7b3

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