Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acda4f27d309107…

MALICIOUS

PDF

84.7 KB Created: 2021-03-22 12:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29ac16554069a53251e850b7776b02e6 SHA-1: 9d207cba13ea3831df9dd7a39f7c7daac40316e1 SHA-256: 9acda4f27d309107e6b9f53e7e9a92cb238f762e0e632c81221b258130be46e0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://xezojetit.ru/123?utm_term=bohemian+rhapsody+trumpet+sheet+music
    • http://copytoshka.ru/6105050115of678.pdf
    • http://detonic-official.website/ringtones_for_android_download_mp3kbifi.pdf
    • http://civiliscmq.online/jeridanefonalisosomu6szf.pdf
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/fekatizijikenag-vojibitoxut.pdf
    • https://jasudelile.weebly.com/uploads/1/3/4/0/134012727/f074f70.pdf
    • http://in-arenas.com/panorama_journal_algerien_en_arabeu5nl4.pdf
    • https://tanedozuwo.weebly.com/uploads/1/3/4/6/134644204/5515236.pdf
    • http://mybiol.site/derulopotogafimuvuvivo0nnrd.pdf
    • http://bio-ita.fun/casio_fx-9750gii_integral_berechnenu6o3s.pdf
    • http://trackcreditscore.info/how_to_fix_whirlpool_cabrio_dryer_door_latchx00x8.pdf
    • http://wgathering.org/866296015829oss5.pdf
    • http://hiziryigit.online/deepak_chopra_21_day_meditationimsf2.pdf
    • http://docita.fun/firefox_gecko_driver_for_seleniumfz0hn.pdf
    • https://mofumamivuzav.weebly.com/uploads/1/3/1/0/131070192/wipogafuxolu-sogonufazalo.pdf
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/4d084.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/woxojuxafopuv/liberty_bell_march.pdf
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_d828e64a51144d6bbd4bf837724f471f.pdf?index=true
    • https://s3.amazonaws.com/xulepiwa/zolitegoji.pdf
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_3f67b0c3cc014e858d615dcf0bb2695f.pdf?index=true
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_9919caa0bfe840c0b03200a1c04aa95a.pdf?index=true
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_0d61a9bdbd584aebb4a96555d36d3b34.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_off0000ffbb.bin
5cc41475ce6490b0259631f86914b80d22d424a3db3317440e0d0e875104d339		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 5316 bytes
font_01_sfnt_off0001119d.bin
9732bd50386451a8ce0271d46595d332147b3017afa9718a5707f1055661e2be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 10852 bytes
font_02_sfnt_off000136a3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136A3 4324 bytes

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