Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7d503228182dc7…

MALICIOUS

PDF

96.8 KB Created: 2021-06-09 22:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9729e431a99d666044d90469ee939561 SHA-1: caa05f2d38b29c81dbf4d9729d46ac7e8d2d31c9 SHA-256: ab7d503228182dc7549d4869ed05b2c5835c14fa3caf575ff1746bb2da2b2611
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful external content, possibly for SEO manipulation or to host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://cructi.ru/pbw?utm_term=five+nights+at+freddy%2527s+ultimate+custom+night+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411923/normal_60526c50cbe8c.pdfIn PDF document text
    • https://ponixojezunuto.weebly.com/uploads/1/3/0/9/130969897/nukunasopotim-boxedejupilil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5ff66813f0df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480736/normal_60524772ca931.pdfIn PDF document text
    • https://gebifafotuzuwi.weebly.com/uploads/1/3/5/3/135324040/8416.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4367952/normal_60afe55a3b15c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://venatulafiz.pbworks.com/f/xukegasegovoxigojin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c2fd92-79de-4ca8-b339-b868977614c4/bissell_proheat_carpet_cleaner_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c917bff4-f59b-43c4-bdd1-b714dfcea96a/78493830545.pdfIn PDF document text
    • http://rukutuxeriro.pbworks.com/f/how_do_i_get_apple_carplay_in_my_mercedes.pdfIn PDF document text
    • http://mejigulo.pbworks.com/w/file/fetch/144602082/tikizitira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625263ee-7248-42d8-99bc-ec8e35ff140b/8927814551.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/what_is_the_difference_between_awg_and_mm2.pdfIn PDF document text
    • http://xawasesofe.pbworks.com/w/file/fetch/144876417/empower_b1_pre_intermediate_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5193c5-9414-4810-857d-bc580843c87e/human_resource_management_by_gary_dessler_12th_edition_ppt_chapter_3.pdfIn PDF document text
    • http://sonubugu.pbworks.com/w/file/fetch/144675606/merefibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80813c6e-f274-48e8-beee-23060827827e/zinipudimiwogikim.pdfIn PDF document text
    • http://luwosotatex.pbworks.com/w/file/fetch/144736230/map_clash_of_clans_link.pdfIn PDF document text
    • http://marutipug.pbworks.com/f/thuppakki_full_movie_download_tamilgun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de945f04-d357-426b-b893-c4b91d9718e4/74927887896.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/the_art_of_electronics_reddit.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
    • 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
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 6676 bytes
SHA-256: eb818d908f85100d3a99250672f03864bcbe34b2514f2b59354f321a79477503
font_01_sfnt_off00010ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 5784 bytes
SHA-256: bce3fc6defdce27a50c49fe6d4ab7b7f9d002adab6a7edf99a5be6119280ba35
font_02_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 6932 bytes
SHA-256: 887de6ef7663140228865b32835daeed0f1c241cafae539307764c27efe3e5c9
font_03_sfnt_off00013564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13564 12340 bytes
SHA-256: 02218f0b06d069beda3e926d7c190e33c6c1707a4abf28b8b7aa879970f17402
font_04_sfnt_off00015be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE3 17444 bytes
SHA-256: b7040c51b0108051e2c756b47875a2515efa3df7b0a5ba0fbbc81dcb80556526

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