Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9e1225467d3fb0…

MALICIOUS

PDF

80.1 KB Created: 2021-03-21 04:03:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5bcf7e785bd925cd012a89439a477101 SHA-1: 53f59ffe2742e048b1cf0c89ce0ab73919814efe SHA-256: 4f9e1225467d3fb08ee5aa203e0fc84233a3cee0bd682a14415acb2f21cca349
156 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 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 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.
  • 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://nipisod.ru/wix?keyword=fs+16+apk+indir+%25C3%25BCcretsiz PDF link annotation
    • https://cdn.sqhk.co/kibukumivu/UAgiUXV/sozuvetebaxajimaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/vemupanilow/crSyji0/79367500444.pdfIn PDF document text
    • https://cdn.sqhk.co/tegimatararo/jfifqge/golden_arcade_hong_kong.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/cXNV9Kt/sudarimu.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/qhfbnhj/electrician_apprentice_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/xinovupu/O3Bidij/at_t_call_protect_stopped_working.pdfIn PDF document text
    • https://cdn.sqhk.co/savimatuv/jjachgd/1414976761.pdfIn PDF document text
    • https://cdn.sqhk.co/rasidepad/iVmhbib/pobirebal.pdfIn PDF document text
    • https://cdn.sqhk.co/gosuzufus/d8IaPie/sefuwonibesuraxamipogamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_5cdc77a8e734477c980b32ebe930250e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/seriposuj/7323244351.pdfIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_7971c01516b54b2793d1e5007cd2ae3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80af4a81-75d9-4ceb-8e3d-0708b02dde5f/handy_stitch_handheld_sewing_machine_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/texogu.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_afa39d699321417aae905a41c9ab8866.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d31c9cf-9728-4751-90ef-04bb51c1c73e/fupiwon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2e9c1b-af12-4507-b6c6-92d0718c41bc/can_i_connect_an_external_hard_drive_to_my_dvr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b68f3d4c-0e1e-4f9f-ab87-8bc8c4a57497/nunitusoginasodemi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/anglican_shona_hymn_book_free.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_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 5428 bytes
SHA-256: c3ab66584ab3627b9a3af8a76d42df9d3b4f4bb952b684a4fd1adafaf14e13dd
font_01_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 12836 bytes
SHA-256: c10f5cd23afa144b350b1e48b2056dd72eae34a0ccda79dc88b9cc51302396a0

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