Malicious PDF — malware analysis report

Static analysis result for SHA-256 577f7423df4042dd…

MALICIOUS

PDF

99.8 KB Created: 2021-03-16 18:14:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b24b859c49b0e31ce06c3b6dd3aaa65e SHA-1: cf1294d4057980973352ed829368ccca8174e835 SHA-256: 577f7423df4042dd3d6e2e0e3d17ecd2700c8aaac5d16bab8bf56e423c017a41
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation attempt. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external URLs indicates a potential for redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://nipisod.ru/123?utm_term=calf+sprain+exercises+pdf PDF link annotation
    • http://xavelodezazil.iblogger.org/wupogateg.pdfIn PDF document text
    • http://wimawukit.iblogger.org/dt466e_injector_o_ring_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/Jpha5hf/venipini.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/jiGjiiw/solupunaxunugibitu.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/emsjhU2/bubble_shooter_sea_pirates.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/ijieZ5l/96766415864.pdfIn PDF document text
    • https://cdn.sqhk.co/rovukupovumo/njgjeHZ/88166944538.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://jojudodadanu.epizy.com/jemasazatan.pdfIn PDF document text
    • http://ketaxesam.epizy.com/welch_allyn_767_otoscope_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/soccer_manager_2020_0._1._6.pdfIn PDF document text
    • http://zelixedamaxux.rf.gd/business_plans_for_small_businesses.pdfIn PDF document text
    • http://malusamum.rf.gd/what_is_centralization_and_decentralization.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/kubofepakewakewob.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_b5e3cef4b8ff42aeb8c853fa202affad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/project_management_templates_free_download_excel.pdfIn PDF document text
    • http://zepurudevivo.rf.gd/pixebatego.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/adafruit_lsm303dlhc_datasheet.pdfIn PDF document text
    • http://zukeligo.rf.gd/farm_risk_assessment_template_uk.pdfIn PDF document text
    • http://welurolakis.epizy.com/carpophilus_hemipterus.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/elf_costume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/leparenekusil.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_fe9e82f8fb064b639bfd9debb5e51968.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/69709136794.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/usmle_step_1_scores_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/dd_ranger_prestige_classes.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_637a1b45123448bfa8e08ed81361faa8.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12839 4836 bytes
SHA-256: 4858e07870f93a9bfca65c7e4cc57d61cd6ec398e29bb8304822d1fd8e2ded96
font_01_sfnt_off000138b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B6 11172 bytes
SHA-256: 4b01ccb4ca731c563b10d102dc289809cf28bfb39ff80cc615d67aeccc5e7e8a
font_02_sfnt_off00015ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA8 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off00017340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17340 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e