Malicious PDF — malware analysis report

Static analysis result for SHA-256 441165836756ce35…

MALICIOUS

PDF

71.9 KB Created: 2021-01-29 11:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04c209a8e05dd208d122e1a096f56e16 SHA-1: 18b71ab7ec070ddb7a032a63ba1c292a79508c98 SHA-256: 441165836756ce352b5f7c1dfbc5453d60a4385c0dad1da2cdab7622815af3d0
224 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and algorithmically generated URLs, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://traffmen.ru/wb?keyword=introduction%20to%20business%20management%2011th%20edition%20pdf%20free In PDF document text
    • https://cdn.sqhk.co/bevurokakug/tghih7K/zuru_ice_blasting_dragon.pdfIn PDF document text
    • http://mon-cmbretagne.com/baby_driver_full_movie_online_free_h01aa9.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/minodidisovoxqy6zb.pdfIn PDF document text
    • https://zupufirelerige.weebly.com/uploads/1/3/0/9/130969681/refol_zoxexazu_tukufamane_fuzakix.pdfIn PDF document text
    • http://fexewivu.iblogger.org/bootstrap_admin_template_open_source_github.pdfIn PDF document text
    • http://dubiniba.iblogger.org/kelubosifafozifizasido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bidivo/82455990809.pdfIn PDF document text
    • http://dimafox.epizy.com/jukexifetolexazolava.pdfIn PDF document text
    • http://wozawexopad.epizy.com/vuxav.pdfIn PDF document text
    • http://feniboladesa.rf.gd/setirosefelukijejivipawe.pdfIn PDF document text
    • http://litopuputorer.rf.gd/archeage_blighter_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/vehicle_log_book_template_excel_free.pdfIn PDF document text
    • http://jigikox.rf.gd/non_commercial_class_a_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/64048932055.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_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 5668 bytes
SHA-256: e18e017abcf48451afba258666e5a9b77c5c2993cbae206e71efcb7c7547edb0
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 10148 bytes
SHA-256: a29c2cb311177663491a35ad80f2472b9d1a7181ebb4ab3f32128f2d865e9413

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