Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c41f3eef01d5060…

MALICIOUS

PDF

79.7 KB Created: 2021-04-26 15:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8cad0329f64adab3d654633b8aafed0 SHA-1: 2d2669ef4dbc3c9757b334bd89b844770fcb2d90 SHA-256: 9c41f3eef01d50605de3aa643143d4f233d38c8c8bbba9e9cf72d04931830edc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier, indicating it is likely a phishing or malware distribution lure. The file contains a large number of external links, suggesting it is part of a link farm designed to redirect users to potentially harmful websites. No scripts were extracted, but the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=pillow+thoughts+best+poems
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5fcdf90aad470.pdf
    • https://cdn.sqhk.co/fogibadeku/eijZheA/double_clutch_riddim_download.pdf
    • https://cdn-cms.f-static.net/uploads/4389603/normal_606371292d88d.pdf
    • http://penoligis.22web.org/fokudofujawulivanogi.pdf
    • https://cdn-cms.f-static.net/uploads/4426545/normal_5fe61876950e6.pdf
    • https://cdn.sqhk.co/warugariluxe/g5Hibha/war_of_the_worlds_movie_download_in_tamilyogi.pdf
    • http://xovipidadodixo.iblogger.org/national_sewing_machine_serial_numbers.pdf
    • https://cdn.sqhk.co/mepapogivoma/Hqheiij/craftsman_air_compressor_30_gallon.pdf
    • https://cdn-cms.f-static.net/uploads/4367283/normal_604d4a41b00dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_2ac2e73783a64d13891cae3d70eb10de.pdf?index=true
    • https://s3.amazonaws.com/nuruvapozixix/60216766139.pdf
    • https://s3.amazonaws.com/sedowedi/paneg.pdf
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_00fc8ab705ec40579190264dfcd92e59.pdf?index=true
    • https://s3.amazonaws.com/boxalewijim/34165870378.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/renupodepozox.pdf
    • https://s3.amazonaws.com/medaliwifufugel/juvegabigudolu.pdf
    • https://s3.amazonaws.com/mejifavo/guided_sleep_meditation_for_body_healing.pdf
    • https://s3.amazonaws.com/sazomo/living_nonviolent_communication_review.pdf
    • https://s3.amazonaws.com/zurovajij/who_made_up_the_third_estate.pdf
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_d39d16cd9da24b1dbce7e309e759aba5.pdf?index=true
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_d7fd91f1692a4f6aaf9b1aae246c4822.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf5.bin
e6f44a6eda80b3b4985d0d036f504e548d46fd2433e3137539514aa35eb94811		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 4936 bytes
font_01_sfnt_off0000fbdf.bin
a221f6445d1e05a765416898c6e50cb10f102f86404992df4d5d2f9b76e00ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 11204 bytes
font_02_sfnt_off000121f1.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 4324 bytes

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