Malicious PDF — malware analysis report

Static analysis result for SHA-256 17155525ca9a90e3…

MALICIOUS

PDF

74.0 KB Created: 2021-04-11 15:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9d91761ada8c970ac532251b22b4d1ac SHA-1: 67b2570b251939202bc919562e1895aa7f270172 SHA-256: 17155525ca9a90e317714a1ebc845116b625557cbef17ef66bdd4151bca7c31c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm designed to redirect users. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. ClamAV also detected the file as Pdf.Phishing.Trojan, further supporting its malicious nature. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lozipotod.ru/strik?utm_term=wordly+wise+3000+book+3+answer+key+free PDF link annotation
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/povotenol-zavoxam-delebosepob.pdfIn PDF document text
    • http://mailedflkf.site/fenajalulikokf5un.pdfIn PDF document text
    • http://brumbum3.xyz/suluvifikemimakasojigjs1rc.pdfIn PDF document text
    • http://romeoplanet.club/75155609142z4dfv.pdfIn PDF document text
    • https://nanuleseja.weebly.com/uploads/1/3/4/0/134012971/770307.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/7842976.pdfIn PDF document text
    • http://noturufupama.iblogger.org/11985777583.pdfIn PDF document text
    • http://nosagebuki.22web.org/poetic_forms_ballad_examples.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/rojikanujebesete.pdfIn PDF document text
    • http://wowitaly.pro/darapivetolekowinogulimeky767q.pdfIn PDF document text
    • http://cg-designer.xyz/8_sentence_paragraphamn4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_4ce96a2688184654a76065ffedc3615f.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_fc5b907ae8814a30876eeea6ab82da2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/ashton_irwin_girlfriend_2021.pdfIn PDF document text
    • http://nemutevo.rf.gd/7223541023.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/how_to_reset_directv_remote_rc65x.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/xizujubini.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_e12ba73bc2a94a068c32c98b64c1b8d4.pdf?index=trueIn PDF document text
    • https://b7c6a474-53ed-4139-af63-4b2f501ae0e7.filesusr.com/ugd/e87294_ddf46a6cf0ed4c7c8ea498361cc1070d.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_d99839bdef94428bbd8e5cc38aa9630f.pdf?index=trueIn PDF document text
    • http://gatataja.rf.gd/fluke_179_multimeter_manual.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_0a5a888916e14a29bef5f3f74cbf1ce9.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_9826534c40d24b0aa4726c6b16cf0c1b.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_3cac7913b41e4318a38617449e8d7863.pdf?index=trueIn PDF document text
    • http://fanurumuge.epizy.com/minecraft_pc_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/ieee_template_font_size.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_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 5620 bytes
SHA-256: 52250aedc4357fe46248ac9f0a08ece2b0d77cb9fd389936a1c98386c2e236b9
font_01_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 10532 bytes
SHA-256: 814a9c72a163496c7194544cdbdbcf14b56f9ac9d61574d1f2c6b5362e971527

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