Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d2599a5d8b946b…

MALICIOUS

PDF

77.0 KB Created: 2021-03-02 16:07:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 59602b074c39a76d3ae5660f3e5093ab SHA-1: df7dab20fa100bbaa743af30375433c4cd903ef9 SHA-256: 81d2599a5d8b946b0b1bdb5181e838cbba5cd77c9861fa8f23d9396a5c1787be
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, appears to be a lure related to relationship values, attempting to disguise the malicious intent. The presence of numerous disposable links on disposable hosting further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=what+are+core+values+in+a+relationship In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450160/normal_5fc702ec10919.pdfIn PDF document text
    • http://complerbnp.com/police_scanners_for_sale_in_ontario_canadar5roz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5fd19c7cc952a.pdfIn PDF document text
    • http://sun-italy.space/molecular_cloning_a_laboratory_manual_second_editionflecj.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/6196619.pdfIn PDF document text
    • https://cdn.sqhk.co/gubogezemazo/EEhihec/divevejexilaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464863/normal_5fda94f4a4bb6.pdfIn PDF document text
    • http://effektzhizni.ru/iti_admission_form_2019_delhi_last_datewgif5.pdfIn PDF document text
    • https://zezonusadife.weebly.com/uploads/1/3/1/4/131410479/5544e.pdfIn PDF document text
    • https://sunenuno.weebly.com/uploads/1/3/5/3/135319001/7837166.pdfIn PDF document text
    • https://xapukuzikoki.weebly.com/uploads/1/3/4/3/134381416/b641341154d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fec40e4b06ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478123/normal_5ffa953c11b78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/tefur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 4976 bytes
SHA-256: 80bddb4d4ad91971b32201cb635f38260d596532e4204e1d19431966a95a8cd1
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 10516 bytes
SHA-256: 56255f8a3ac86e0453aad654ca19c34241eb15c25779ce0f0354a7e51987b976
font_02_sfnt_off000118a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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