Malicious PDF — malware analysis report

Static analysis result for SHA-256 4823855b1716f282…

MALICIOUS

PDF

77.1 KB Created: 2021-05-15 22:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 48293a0501bef0256f71fc35085a4992 SHA-1: d22397673168ecf14fdee5a37cb4bfac3f6020b6 SHA-256: 4823855b1716f2829a12b1139e1ce57e84ab6539d4cdbf8016257d05d5ee0504
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically.

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
  • 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.
  • 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://botokaw.ru/strik?utm_term=why+is+harry+potter+1-4+not+on+netflix PDF link annotation
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/tagotedakutow-pupaf.pdfIn PDF document text
    • https://lipuguxe.weebly.com/uploads/1/3/0/7/130738524/dimikixezejuvi_pipuduma_finejonutapob.pdfIn PDF document text
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/fulebekogalom.pdfIn PDF document text
    • https://meverofukibax.weebly.com/uploads/1/3/4/6/134620555/3847709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_6051cbd91f748.pdfIn PDF document text
    • https://nepunifanod.weebly.com/uploads/1/3/4/5/134524507/3684148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_6016c2304cda2.pdfIn PDF document text
    • https://jesakejijubew.weebly.com/uploads/1/3/4/5/134577011/3781377.pdfIn PDF document text
    • https://zokupirijega.weebly.com/uploads/1/3/4/0/134000213/8480654.pdfIn PDF document text
    • https://xigodawi.weebly.com/uploads/1/3/4/4/134464905/9401465.pdfIn PDF document text
    • https://xesisezedowajax.weebly.com/uploads/1/3/4/7/134729639/ab22f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_81aee182c7dd4a52af7b581c1334c16c.pdf?index=trueIn PDF document text
    • http://volozixoxogibe.rf.gd/pyramid_principle_training_nederland.pdfIn PDF document text
    • http://pakebixulo.epizy.com/how_much_is_the_richest_person_in_dubai_worth.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_3b614f283f0344afb93a769b43719c95.pdf?index=trueIn PDF document text
    • http://bulofowomogi.epizy.com/sears_catalog_house_kit.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/tuvujidu.pdfIn PDF document text
    • http://gaxufaxurawago.epizy.com/35482873472.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_69ec65979d3a407993325d909f54d9d6.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_6bb11e10c7dc40568f7ab15c4ccb9c73.pdf?index=trueIn PDF document text
    • https://29fa80ab-3b21-46a5-a5c9-66d7a3d84e9c.filesusr.com/ugd/eb9fb8_07a31dcdc3fb4cb48401d9a5690e13de.pdf?index=trueIn PDF document text
    • http://rigutogivopum.epizy.com/dymo_letratag_lt-100h_handheld_label_printer.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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 5344 bytes
SHA-256: 0767ce31cbdf70811824eb7298f049e04c19a14609be546e1b5fd47fe09e035a
font_01_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 11028 bytes
SHA-256: 3be75267df3551d1a169d20a89f8ab41d0042f1f07e47e638dfb51f620436769