Malicious PDF — malware analysis report

Static analysis result for SHA-256 523fdc3a6a1b3dec…

MALICIOUS

PDF

66.9 KB Created: 2021-04-07 08:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4b470fdeaa92c82875cb5b785aefa82f SHA-1: 25bbd73bc8a578810acc3f62ccb12d4201c58324 SHA-256: 523fdc3a6a1b3dec1c5837196aa0d7088b6356b85db2f162f5125c02dc7f008f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to 'Animal farm audio book free download pdf', indicating a lure to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=animal+farm+audio+book+free+download+pdf PDF link annotation
    • http://in-arenas.com/webufaziwesadewafam5ycb.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/0jjjcih/88646857189.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/ZigdicA/varopedal.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/hdjjiaE/escape_from_alcatraz_full_movie_online_free_stream.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/qgeidGs/retroarch_n64_core_switch.pdfIn PDF document text
    • http://sendgrid-de.com/calmer_easier_happier_parenting_book2xhrl.pdfIn PDF document text
    • http://solent.bar/what_does_the_numbers_802_mean_in_numerologyqw2r7.pdfIn PDF document text
    • http://gbo.guru/limit_state_design_of_steel_structures_by_sk_duggalbdgwn.pdfIn PDF document text
    • http://reduslimitalia-official.site/aastha_movie_tamilrockersho5p1.pdfIn PDF document text
    • http://tryse.xyz/tinanunugimigozemovabogohbanx.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/cWvHVhe/sani-_cloth_bleach_wipes_walmart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_fb79ccf635e14806ab2846d56a843b67.pdf?index=trueIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_bc76d983bb57499c8142c29c7fbce7bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/calligraphy_alphabet_practice_sheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/vox_ac30c2_tv_review.pdfIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_250b4d0d17a343269b4e6ccd0a24bdde.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/rock_candy_xbox_one_controller_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/nepekal.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/chal_chaya_chaya_song_pagalworld.pdfIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_9de34b52a3734ee497d961847483fffa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/nikebifuwosabegiwekupoful.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 5296 bytes
SHA-256: 66a4d9a030a2eade06c17938cc3b59939d160b4819e051bdc1cf005d0e1114d3
font_01_sfnt_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 10404 bytes
SHA-256: b5165f8080fd4ea94cf0f100298d8716fd5866bae532715d85017343ee35de07

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