Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f36ff8c7f479ca…

MALICIOUS

PDF

69.9 KB Created: 2021-03-25 10:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cea44bbccd5f7853e5c9d39bbba5471e SHA-1: ce75f234c99e8e7b795e17ee3f6469d30309e765 SHA-256: 87f36ff8c7f479ca998ba468985ec04e6cd8cf3fe9438a15023be391cac1692f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external PDF files hosted on various domains, some of which appear disposable. The primary URL suggests a lure related to downloading a strategy guide, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the distribution of further malicious content.

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.
  • 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://gimoguvi.ru/strik?utm_term=final+fantasy+tactics+the+war+of+the+lions+official+strategy+guide+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459792/normal_5fd968c6bf841.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450870/normal_6002570233464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426422/normal_6042c88fa8b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454435/normal_5fd78d49e5325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389387/normal_6055159f45db3.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/emil_and_the_detectives_movie_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413228/normal_602ff506b29ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_5fe640fb54c76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366665/normal_5ff292e3bfb16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_a2c3f48e6f0d4460a11cf689963d1c15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c73fd2-6911-4cc7-9f08-2a6ae6cda19b/phrasal_verbs_with_examples_in_english.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_b60f245835c042939ee2eab53f5b3376.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_952cff3e744445098066b6b382312c97.pdf?index=trueIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_c8952910e33c47da91490206cbdc7713.pdf?index=trueIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_49cde0c8af5b40949eb9094f0edb1c4e.pdf?index=trueIn PDF document text
    • http://nisetekotixob.myartsonline.com/bls_2020_guidelines.pdfIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_4328653a89cc40f9bfa674a9c0586455.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa31416b-533f-4356-8475-78c022e95e0a/how_to_replace_fridge_light_bulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8acc86a-ed0b-496b-8744-595737b32bc0/educational_psychology_phd_programs_in_usa.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_2e90a2be593d4863ac947eb81366a741.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_326bb33bea6b4c92bb78552c5b2fa33e.pdf?index=trueIn PDF document text
    • https://3315be42-5dab-4b6e-b44d-105cb490973e.filesusr.com/ugd/2e3488_c548e3c14e484470bd7c6c9b1f9ea0c7.pdf?index=trueIn 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_off0000d2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2ED 5568 bytes
SHA-256: fad16546984b6b394afeb0da1a697709fb46b76d7ba87fcf34ab6df89c58d1f3
font_01_sfnt_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 10416 bytes
SHA-256: 899c90a2dfd03c4e7c542941deccf50b591c49bcdfda0ce83a8563bfb73eda62

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