Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4c2684028799b2…

MALICIOUS

PDF

118.4 KB Created: 2021-02-17 07:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9923cd6c7c8dab86a2d0d33b6904beee SHA-1: f2206b612f2eca7bfe8fe9d3f17ef40746e70fdf SHA-256: 8e4c2684028799b2ee81fe77845dd90818e8ef4e60855e8fc8813421d3f92e7f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://jottigo.ru/wix?keyword=kik+freeze+code PDF link annotation
    • https://cdn.sqhk.co/nobixapo/jaibjwG/tiny_epic_zombies_instructions.pdfIn PDF document text
    • https://venefosek.weebly.com/uploads/1/3/1/8/131871910/227ab254a.pdfIn PDF document text
    • https://dakijixubuleze.weebly.com/uploads/1/3/0/7/130740496/497d92d41.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/dhRQoB9/my_electric_meter_is_not_spinning.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/jJRTaia/auto_change_wallpaper_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/ighcx1N/coloring_pages_brawl_stars_max.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/JjewtSX/55546015525.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/jcieB3I/wallpaper_tumblr_cute_black.pdfIn PDF document text
    • https://pifaxatopegamu.weebly.com/uploads/1/3/4/1/134108845/likuvejaxuxu-lezujaxi-finadatomugifo-mibasixire.pdfIn PDF document text
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/789644.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/aifiihb/best_women_s_road_bike_2016.pdfIn PDF document text
    • https://jeporifitev.weebly.com/uploads/1/3/4/2/134265357/453618.pdfIn PDF document text
    • https://zunitilamurako.weebly.com/uploads/1/3/4/5/134529552/4284138.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/jd6iayu/30270635714.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
    • http://mekamaxabojumoz.epizy.com/blank_periodic_table_of_elements_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/85719895243.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/falciform_ligament_ct_anatomy.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/wusobatasut.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/jurnal_angina_pektoris_tidak_stabil.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C85 4280 bytes
SHA-256: 2506e5c80f8ff49dd5fc01a9cb9608010171b8f90bd344b5055a0cca00e647a2
font_01_sfnt_off00015b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B0F 1956 bytes
SHA-256: 1a02017d8f9dfccebdf658a6e57aaf3f1db45e167806d7a7e54ac7b5b333925c
font_02_sfnt_off00016432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16432 11840 bytes
SHA-256: 13a6fb6bdd171e26c2fe8fce55215cb2e02a3538d20bb4f0e5fea42c4b396150
font_03_sfnt_off00018ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CA1 19512 bytes
SHA-256: c3102c066e0265237ff3a848a3aa04a31c62d77948274397722ea057391d7a4c
font_04_sfnt_off0001acc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACC6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
font_05_sfnt_off0001ba89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA89 6380 bytes
SHA-256: e21e414e80c9696a4ed6e69e6110347c256ead4c8298e36298a85037b3301813

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