Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac5faf61fef9ef2…

MALICIOUS

PDF

73.9 KB Created: 2021-05-08 23:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d9bb82dac6d2aa1918da4ed6104ed381 SHA-1: 59ded8a379ea5f8e3c87fadd1901ad779af7b4cf SHA-256: 3ac5faf61fef9ef2fedf5dfd544414803bf6a0cfa7907eda024097c4b1f9ad60
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9992

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=1st+grade+math+word+problems+online+games PDF link annotation
    • http://hurricane1.space/dakiwapenis0d6hw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_6015223d7d411.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487194/normal_5ffd647786255.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/39017637001.pdfIn PDF document text
    • http://lonotel.mygamesonline.org/60119155904.pdfIn PDF document text
    • http://bijowuxupolapi.sportsontheweb.net/13130357920.pdfIn PDF document text
    • http://prostotit.site/dyson_v8_animal_cordless_stick_vacuum_cleaner_costcob6p02.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/vulino.pdfIn PDF document text
    • http://domainlimax.xyz/how_to_reset_whirlpool_refrigerator_ice_makervkmev.pdfIn PDF document text
    • http://qrastenmap.online/how_social_cognitive_theory_worksqonul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0a4027-f613-4e38-9528-c64cd8f73cc0/what_is_r_ideal_gas.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/51197796632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c256f20-e6c2-43f2-81fb-03a8f1fca7f9/webogefatabagozozidijiset.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/25478748421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0437a046-a6cb-43ea-89ba-9ba5d4c8cd2a/48745651651.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/meditation_music_for_sleep_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e2614e-5f21-4c7e-85ad-7070d2a58947/how_to_write_research_paper_ieee_format.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/char_broil_performance_475_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/magufopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74af9b79-3380-4da6-81ca-ae564a6534ef/buffalo_rice_cooker_cooking_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542a1f10-9ee5-429a-9c51-6717774ded4d/23710219562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e30a2f10-2468-4b8a-8869-30cca4a3480c/parmesan_bow_tie_pasta_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15f5449-cfd0-4f7d-aed3-f56f9df0e057/best_romance_books_like_nora_roberts.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_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 5560 bytes
SHA-256: 941c5b46183a5e1d93617cff21a4728c167d61245b47397bf4d1884dc1006a0b
font_01_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 11504 bytes
SHA-256: cecbb685afc96b262d16eba29dad9b919a9a11356ef797520d2329e303420c62

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