Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe3371f25316666…

MALICIOUS

PDF

89.3 KB Created: 2021-04-17 01:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 165ace4ed11fb7e21ce5aab4fc9a61be SHA-1: f2c4b5660eac0c3dd407398dc328c11104c04321 SHA-256: 1fe3371f25316666bdabe7c8224697d1ca759d1e3eabc4bc4a9e9b0b3ec29335
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The primary URL, 'https://fokemale.ru/strik?utm_term=glencoe+geometry+chapter+5+quiz+3+answers', suggests a lure related to academic content to entice clicks. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=glencoe+geometry+chapter+5+quiz+3+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485165/normal_60397cc285b5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_602d96b12177f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5fd3cb9f924e6.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/36386dbe-0b01-4ad8-bdad-99783d786450/bulovugakap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de71212-fd03-4de5-a832-2c8630232490/what_are_some_examples_of_a_complete_subjective_description.pdfIn PDF document text
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_584a1cf2bf6e40d98ad5b947ab26609a.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_12807658a4d94320bfc94df3d5a7b0d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ad9054-f619-4fe8-ae1b-6ebd1a067850/xagavimoxemavabizewoluri.pdfIn PDF document text
    • http://kenozajawatulaw.rf.gd/badoo_apk_premium_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d5ad851-d0aa-4588-ad20-399ccb125f90/97416184087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75172441-c9d5-414d-bec1-34c1b94c60f6/what_year_did_the_first_harry_potter_book_published.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88893e39-55bb-499e-afd2-a088fddca4a9/97799807259.pdfIn PDF document text
    • http://tapanowi.epizy.com/zinewesowibator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5457a989-40d7-4596-be68-3639b817edab/soundpeats_truefree_wireless_earbuds_bluetooth_5.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d6d4f3-448a-4e82-8914-abf28cc24959/formulas_de_geometria_analitica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbbc4174-ea53-494b-812e-6e4b25b053c6/dolphin_gauges_speedometer_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5f82b3-e0bb-4c67-84c5-c9513286291e/gordon_ramsay_ultimate_cooking_course_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7023e3be-bce5-4353-8787-891c100a66ec/tri_state_bus_schedule_highland_in.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_b965a329031145ecadf8e53c2dadf22b.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 6036 bytes
SHA-256: f42901a00cf6ab47bd3996b29b6382627ff2ec06e253368500ea1da46feeb99a
font_01_sfnt_off00011978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11978 12440 bytes
SHA-256: 5f839ad11f39013546e2ffb21aa06a46c306d827cad9683a0f2c2fc275f1b43b
font_02_sfnt_off00014338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14338 16072 bytes
SHA-256: 3da9309f7c28e01a20d15285b754fad9116e6eb7744d168a0fff2950d6122081