Malicious PDF — malware analysis report

Static analysis result for SHA-256 36390b41e0c650bd…

MALICIOUS

PDF

75.9 KB Created: 2021-05-15 03:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1e6666137965d9b673bfaa5eaa470583 SHA-1: 7247cef8c53dc98524ca3bd21ec7e72bf929be6b SHA-256: 36390b41e0c650bdd80f630a2bd8b8f5309f7cbae708ccd6440359ef712a0565
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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 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://soxebez.ru/strik?utm_term=roosevelt+famous+quote+about+pearl+harbor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480886/normal_5fe6e089affa9.pdfIn PDF document text
    • https://cdn.sqhk.co/nufopusifa/O6hanwh/maritabitejariloli.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/jggc4he/boolean_cut_3ds_max.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/iiicGCa/furuvuzimule.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/pijR7Nx/2d_shooter_games_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/ioXingi/18271227719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_60588cbec82c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480588/normal_60301aad14dbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/janodojivi/zulirawakuluviworesusid.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/measures_of_relative_standing_and_boxplots_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/astrology_for_beginners_bv_raman.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/bodo_bwisagu_video_song.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_46322897f56c40808a1aa5423a248b4c.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_3f9d841495604dfc804af86345197007.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/fugebudezakitubeteponox.pdfIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_b33ac4deef9149e7a765956939cf0539.pdf?index=trueIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_8bd7cbfe580b48eca13c4f686fff3a50.pdf?index=trueIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_55b1fec8a60742e49933179b188d4be1.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_b80b22c239e94020b0c8abcb3ff5192d.pdf?index=trueIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_4c3ffa024cd94ee0888d57008a9df14b.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_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 5472 bytes
SHA-256: 99c09a4a98b8bcefedf12e5fc81fe174ebe353f0cd9cdd24d7a046e926dc9f82
font_01_sfnt_off0000fd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 10784 bytes
SHA-256: e0e5e653c91ee485ef66fe3097933617fdb1ec3b08eee04d2616973d010f50a1

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