Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc890dcfd4424bea…

MALICIOUS

PDF

85.8 KB Created: 2021-03-24 15:15:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 58e9d7231b9c6348c8faa8e6712a864d SHA-1: 25e7d4cf5c27a799588a65aaf27599cf194f8137 SHA-256: cc890dcfd4424bea5f1f1da3fac47780a3560b3ee3cd25134aa3faef212ce3eb
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or spamming campaign. The ML classifier also strongly indicated maliciousness.

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
  • 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 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/award?keyword=alfa+laval+separator+manual+pdf In PDF document text
    • https://xuvamedinomu.weebly.com/uploads/1/3/5/3/135392700/9081260.pdfIn PDF document text
    • http://xviiivbgz.com/ex0y8.pdfIn PDF document text
    • http://strita.space/taylormade_golf_m2_manuala0ivm.pdfIn PDF document text
    • http://durenegom.22web.org/how_to_get_knights_of_the_round.pdfIn PDF document text
    • http://logvoz.ru/62813259679wiwg7.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/gcThhvL/xepaxinenuzunidod.pdfIn PDF document text
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/533683e5bf8.pdfIn PDF document text
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/912164.pdfIn PDF document text
    • https://cdn.sqhk.co/menidume/s6jgjaW/linear_inequalities_word_problems_worksheet.pdfIn PDF document text
    • http://enots.space/juvebod4t32k.pdfIn PDF document text
    • https://rujusuxiledajo.weebly.com/uploads/1/3/4/8/134861970/fatuxugagazufoz.pdfIn PDF document text
    • https://jabikazisejifo.weebly.com/uploads/1/3/1/6/131606509/vuxenawoso_mijol_mifoda_puzetomopipo.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/igBhigg/buy4baby_buy_sell_baby_products_online.pdfIn PDF document text
    • https://cdn.sqhk.co/goxupolofodi/haj6rUK/free_italian_music_download.pdfIn PDF document text
    • https://futilupotozuvat.weebly.com/uploads/1/3/1/4/131454482/5aeae728.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/jh9jagf/sovefipanemazijilazovol.pdfIn PDF document text
    • http://wonelosixep.iblogger.org/43473818078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mutifesojare.epizy.com/pdf_passei_direto.pdfIn PDF document text
    • http://xewofikedufika.epizy.com/76623555379.pdfIn PDF document text
    • http://bijamujijupife.epizy.com/movodevesaduxofixorarepu.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_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 5236 bytes
SHA-256: 6a78b16a28e482ec2a715f4a13be2ead27d66202a54ded14ff8244c8802d7916
font_01_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 13780 bytes
SHA-256: 83b71b5207d462e953e9393fe302cf4b934c3a1f64ea74b996d53491ad086249

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