Malicious PDF — malware analysis report

Static analysis result for SHA-256 428703ec27dbf914…

MALICIOUS

PDF

76.7 KB Created: 2021-03-19 18:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 36e484d1f4861c1b6e32dda513e71f81 SHA-1: d98ff6400cd34b4b32507ff03566b0744d76aa5e SHA-256: 428703ec27dbf9144c1cb0874259482bb202829b237c878647919a1118486f0b
226 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 ML classifiers and ClamAV, indicating a phishing or malware delivery attempt. It functions as a link farm, directing users to various external PDF documents, some hosted on disposable domains, which is a common tactic for distributing malicious content. The presence of a 'Password-protected archive lure' heuristic suggests a multi-stage attack where the user is prompted to download an archive that requires a password, likely to bypass initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/wix?keyword=animal+jam+free+member+accounts+2020 PDF link annotation
    • https://cdn.sqhk.co/dubagojovo/FiegcrG/bail_information_form.pdfIn PDF document text
    • https://cdn.sqhk.co/zovifesojeme/idricha/freudian_definition_psychology.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/lifjdfR/the_crossings_at_carlsbad_golf_course_scorecard.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/ihylhe3/bedopumepajejob.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/tjjMqid/63650728303.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/bic2rid/get_tiktok_followers_free_trial.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/v1jjQT3/mcafee_test_virus_file.pdfIn PDF document text
    • https://cdn.sqhk.co/nugubirudif/adiaMDG/38260865026.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_3d2f041dcc0b41ba9ed8e7047df48731.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfbdc883-5604-431c-ab11-921bef031943/weight_watcher_food_scale_manual.pdfIn PDF document text
    • http://duvodix.myartsonline.com/classic_human_anatomy_book.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_8da333e088a24d2781ea511b6a1fa1f1.pdf?index=trueIn PDF document text
    • http://dubanexotokegel.myartsonline.com/74283249859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61c86ac-3c6d-4101-9a5d-f407185e3482/parts_of_speech_full_book_in_bengali.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_0726fcd4a8884001a9bdb144e1a81f3a.pdf?index=trueIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_9aefac3ab8d7438e977eb9391e798c9c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b6a85a-be15-4d9a-a74f-f09a108651d8/what_is_the_next_book_after_flowers_in_the_attic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb91931-0c7e-44dd-aeb6-32896bf215b7/adivina_quien_soy_juego_para_nios.pdfIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_2da69cd9c8944341803d4ba9c1a0c516.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 5388 bytes
SHA-256: d9f2283fdff9b63447fbc3c7c51831531d5fbc02bd8cbbc755b1f4abd296a64d
font_01_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 10652 bytes
SHA-256: 4a5faa907280dcdf048711a055081732fe26b08aa10675198e72262de09c85d0
font_02_sfnt_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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