Malicious PDF — malware analysis report

Static analysis result for SHA-256 901b565a45e97508…

MALICIOUS

PDF

63.9 KB Created: 2021-02-21 09:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 85c9b830a580ba362e7c092d8bbb9ece SHA-1: aabb43c1470881433f047a97216f297f4cbb7cc4 SHA-256: 901b565a45e97508c3116388bf7340a161f2eca68644c18b790aab75b2513579
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to reference popular media to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=attack+on+titan+manga+volume+24+free PDF link annotation
    • https://vurofagulomefu.weebly.com/uploads/1/3/1/4/131452840/vifudidezew_milidofo_nemutik_vevosezarafanaj.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/EZ3gchf/airbnb_san_diego_with_private_pool.pdfIn PDF document text
    • http://odemebayisitrafik.com/hootsuite_social_media_marketing_certification_answerskh5bx.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/geforifavur.pdfIn PDF document text
    • https://melugazeso.weebly.com/uploads/1/3/1/1/131164252/23325.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/lY9GhfF/29626991406.pdfIn PDF document text
    • http://selowopax.22web.org/what_do_i_need_to_renew_my_cdl_license_in_oklahoma.pdfIn PDF document text
    • http://thesimplycompleteseries.com/eviction_notice_template_new_jersey64kfw.pdfIn PDF document text
    • https://kagozekexep.weebly.com/uploads/1/3/5/9/135956698/6450481.pdfIn PDF document text
    • https://sulumakopata.weebly.com/uploads/1/3/0/7/130775191/2635434.pdfIn PDF document text
    • http://wizomokupelew.iblogger.org/mevonikite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484997/normal_5fcc1ddd881ff.pdfIn PDF document text
    • http://theboldpantsproject.com/birilumlrfz6.pdfIn PDF document text
    • http://yewes.space/35429996896x4fct.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/nth_term_linear_sequence_worksheetor89x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_602885596098b.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/iZjf2ro/75013842673.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zilamefuwata.rf.gd/47437594149.pdfIn PDF document text
    • http://lutusodil.epizy.com/what_are_some_of_the_most_difficult_question_to_answer.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_off0000bd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3B 5356 bytes
SHA-256: fb3a50ebef9a3c25655a23e99fe8aca15ef9d672943923dbde42b189eb01f3d4
font_01_sfnt_off0000cf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF77 10148 bytes
SHA-256: 8a78b32678b7ccb39d4740fd37c4f6b0a3a6ae4e0f1acfec414028cc63d5f739