Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bc0f3ee4a3c057…

MALICIOUS

PDF

75.5 KB Created: 2021-05-10 12:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 409f0b205149000c89226a7c6e42693c SHA-1: d708e12a52a8ed357a313956aee844ee51b547c5 SHA-256: 20bc0f3ee4a3c057372e64529eabd8977e86ca09244976683c32a2cab1c6b739
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=student+loan+payments+suspended+uk PDF link annotation
    • http://damita.fun/6641386958985iks.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/practical_sigil_magic_espaolxvowz.pdfIn PDF document text
    • http://yeswins.space/43560957204yu3wr.pdfIn PDF document text
    • http://nukels.xyz/my_beloved_world5vxr8.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/53061383588xizzg.pdfIn PDF document text
    • http://allostar.buzz/kapalimuzozivuletuwusenulactc.pdfIn PDF document text
    • http://senteber.site/free_marriage_counseling_near_me_ukrx9rx.pdfIn PDF document text
    • http://opticsystem.website/nixijitaranupibotufozizeeg0zm.pdfIn PDF document text
    • http://stingeksoj.online/77734286323ecd05.pdfIn PDF document text
    • http://wacc-cat.org/movies_free_online_without_sign_up8kflk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_56a29384e95541aaae18f5350b059e4e.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_3ffb0bedad7d4f6c8c341f84b7841d23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61da6a85-a0fc-42b4-951d-d51364365e99/new_england_roast_beef.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/how_much_does_it_cost_to_replace_a_magnetron_in_a_microwave.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/how_to_open_up_wii_u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e91497-faa7-4762-b6de-de276aa2e8fc/what_to_bring_to_rmv_for_permit.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/4742828997.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_45c8b1253027445494c964c1d7d9000d.pdf?index=trueIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_ee561e4f05154201823d5bac7849f755.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/874b1b7d-f6a7-4514-a13f-7abd88a031dd/45869370098.pdfIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_7164ca7280294c09ac9385b445b5175f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8c5224-5a6a-4479-a338-d4e9be21d591/jane_austen_novel_emma_summary.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_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 5280 bytes
SHA-256: 30b01d5203b6f2a6bdb25f2f56f1ca1e1df91386844b8b01fa2b2fb201ba3918
font_01_sfnt_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 10780 bytes
SHA-256: f26c3b1f24f66df41a47b5eae0000bda4026bb6937b43cdd4aab4bf900262f5a

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