Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c1ee470792a1f9…

MALICIOUS

PDF

82.7 KB Created: 2021-03-16 12:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ac9dae0276c2459d2dc11ef68841a850 SHA-1: ab652362eea457ed5ac09ef3e817a78897dfc491 SHA-256: c3c1ee470792a1f91abea4b667055552ccf5e95a6925dd48323a5434cb23d9e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be SEO manipulation or distributing further malicious content via the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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/wix?keyword=glencoe+algebra+2+chapter+2+test+answer+key PDF link annotation
    • https://cdn.sqhk.co/noperizapewo/dcPhhYu/74927867831.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/lAGkahe/64747682681.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/Cghgaig/44670173111.pdfIn PDF document text
    • http://kopirugi.iblogger.org/believer_imagine_dragons_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jomovexujufadi.epizy.com/balakrishna_legend_songs_free.pdfIn PDF document text
    • http://nofexezizakizu.rf.gd/how_to_adjust_temp_on_delta_shower.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_ccf4669a9570414baf1644481b872c91.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_c7abcb6486b74f35bced96f47e8eb4e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/android_google_login_12500.pdfIn PDF document text
    • https://d2ffd92d-ad89-4e9b-8359-126286817a3c.filesusr.com/ugd/dd9784_60820fd49a2a47a69a3d3c9e82befa2f.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_6c4fd3bb9e6d4c4ca293039d975c157b.pdf?index=trueIn PDF document text
    • http://diverozisutujew.epizy.com/nice_guidelines_hrt_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/54918980947.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/sesajifadulinasavuxani.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_ee60f75bae1043a28d68545748295758.pdf?index=trueIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_eca638805f8143e3aa506e12d23fe2d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemazun/introduction_to_media_systems.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/cfmoto_650nk_performance_parts.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_933c8b2c54f04391bfcb096d1106d6bb.pdf?index=trueIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_978e6db3d6204550a6bec187bd5cf26b.pdf?index=trueIn 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_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 5756 bytes
SHA-256: cdc000d1919b5b91aad826a9a39332fec51f451d0c2d3806437da15952a4fc4b
font_01_sfnt_off000116b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 11400 bytes
SHA-256: 46c89b89a35aef5d5fb4bbc4670ac01a74592d0ba46f0cf989d31fa3f8a29925

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