Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bb3537a461e473…

MALICIOUS

PDF

61.8 KB Created: 2021-02-10 19:13:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cf6fe81fbdbb673cfcc6c2f2ad1ed222 SHA-1: b6008acff5df15713979da1686a50c803a26ec9d SHA-256: d3bb3537a461e47370edbfffcdc06619da263a3a7098f530c7f51af9cab6bb24
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which lead to disposable hosting or known malicious redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the embedded links and the PDF structure points towards an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=mision+y+vision+de+coca+cola+femsa+mexico In PDF document text
    • https://bagobizofenagex.weebly.com/uploads/1/3/4/7/134767931/7d8e32d0017.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/geigyC8/lightmv_video_maker_with_music.pdfIn PDF document text
    • http://pejofewetoz.22web.org/geekvape_aegis_legend_user_manual.pdfIn PDF document text
    • http://bijipejip.iblogger.org/phd_thesis_breast_cancer.pdfIn PDF document text
    • http://help-nanny.site/lr_eswari_amman_songs_free_tamiltunesoehv6.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxatotukaru/5jijcwv/invaluable_adjective_in_a_sentence_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/gjggcjd/punjabi_sad_lyrics_status_video_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/fggSqif/20288129159.pdfIn PDF document text
    • https://cdn.sqhk.co/kemomonil/38xBRBR/jagul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojosikol.epizy.com/60884720225.pdfIn PDF document text
    • http://soburuwukipo.epizy.com/year_1_maths_worksheets.pdfIn PDF document text
    • http://kodugexibitomo.rf.gd/59413609233.pdfIn PDF document text
    • http://nawonarubital.epizy.com/fly_sheet_music.pdfIn PDF document text
    • http://besowotu.epizy.com/kushida_shrine_japan_guide.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_off0000b90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90B 5308 bytes
SHA-256: ddd5b1b896c3ccd1053b5dec2fa64200caa7c6952d7217fd3681ee0239c4b840
font_01_sfnt_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 9052 bytes
SHA-256: 08c984e3613a38460671cdc866d2c2fbf6a833b13c1251048bbd6c5446bc0334

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