Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07e1bbc00197d02…

MALICIOUS

PDF

71.3 KB Created: 2021-02-24 22:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cb2185f57c5c32b9d2f411f27530efad SHA-1: 1be0e8df50262588d92c4ffa858cdbe648903430 SHA-256: b07e1bbc00197d0262254408ed26fbd531ecae998dc55f265cb2cd9e81f29a36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://jottigo.ru/award?keyword=bergey%2527s+manual+of+determinative+bacteriology+latest+edition PDF link annotation
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/ce9b2f74.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/lavoxulijalujediguluj.pdfIn PDF document text
    • https://mefusinumobidal.weebly.com/uploads/1/3/4/6/134679396/rifelo-pobizimenisitu.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/how_to_save_cisco_config.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/3941179.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/j9p4aGB/zowojifepazakixunazobev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiporiri.rf.gd/ions_are_formed_when_atoms.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/zuwogojuzapokabe.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/19508974290.pdfIn PDF document text
    • http://gasoxesa.rf.gd/blackmart_alpha_app_free_for_android.pdfIn PDF document text
    • http://denakisewir.epizy.com/sekiro_true_corrupted_monk_guide.pdfIn PDF document text
    • http://livivisobozi.rf.gd/craftsman_17.5_hp_riding_mower_manual.pdfIn PDF document text
    • http://zasegusof.epizy.com/analisi_del_periodo_esercizi.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/susubasilejuxobifuf.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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 5724 bytes
SHA-256: d20f0ff975717af98765d4f0f87163676f2a0107183046032f7014eced5ce61b
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 10520 bytes
SHA-256: fe3c33828b94a6f7a3b84b7db4cf3cd402042ba2a8fb7717607a894a1a1d0b05

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