Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f5e9c7808446e6…

MALICIOUS

PDF

75.7 KB Created: 2021-04-04 00:39:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6153e60e3775020a1a1df9cd6cd09b3e SHA-1: b653405eb7ab6c863de5301e74c727c2029109c0 SHA-256: 90f5e9c7808446e6adb92b6e3bb76a7e47186c0e34f5845419703e56d10cbae3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/123?utm_term=bed+sheet+sizes+nz PDF link annotation
    • https://cdn.sqhk.co/woragumokewi/eYI9qEM/zombie_frontier_sniper_apk_mod.pdfIn PDF document text
    • http://usesol.xyz/aushadh_darshan_acharya_balkrishnaqtgx5.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/c9oibjd/voronamubinufa.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/k3wDVhh/maze_procedure_medical_term.pdfIn PDF document text
    • https://cdn.sqhk.co/zodunoxurob/jcShgjg/furreal_friends_gogo_my_walkin_pup_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/fidumugovoz/sibiihi/imdb_movies_watch_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/oghjhgf/exoplanets_thousands_of_new_worlds.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwavewo/hdhcieE/easl_ascites_guidelines_2017.pdfIn PDF document text
    • http://sovaxalute.22web.org/books_on_essay_writing_free.pdfIn PDF document text
    • http://gatorama.site/niwomaletawaj3y253.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/jaVibed/53961201948.pdfIn PDF document text
    • https://cdn.sqhk.co/gajalalike/ihifhdz/schedule_template_free_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/wisulekekij/aOhaaNG/laxajexujubaragaxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_428356fdea074303a2b1f03b9060b5cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/bergeys_manual_book.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/wordscapes_answers_level_1385.pdfIn PDF document text
    • http://wozabuposeg.epizy.com/77937863708.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/predictable_revenue_audiobook.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_8e9052512f5c4f969193b21efa880b3b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokamoba/46006185014.pdfIn PDF document text
    • http://dozudaz.epizy.com/lefuvugepuzesirutipebu.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_72f419d3a00c4d79985d8fdf497e452c.pdf?index=trueIn PDF document text
    • http://revujaruk.rf.gd/mga_halimbawa_ng_abstrak_sa_akademikong_pagsulat.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_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 4676 bytes
SHA-256: 2e7c7aef09ac0f8eefa3785d8d8c4f2da4a0705e5593c9e715bef023c157e050
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 10904 bytes
SHA-256: 5b508ed6562c4678bd2d5d1462b2d52f75e7ccfe6f90723376628971d6512cbd

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