Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdef354154722fb…

MALICIOUS

PDF

66.3 KB Created: 2021-04-13 15:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eee7fdfbe5c4d955276c74195d1ace2f SHA-1: 497f1a078fd896b6483887315b6419bf9d5b350f SHA-256: bcdef354154722fbacf5f787aa61010bd255b302f01611887c14756a04e3c0aa
186 Risk Score

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-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.
  • 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=export+regression+table+r+to+word PDF link annotation
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/vosiwuli/jcjaT4t/biscayne_bay_flats_fishing_guide_miami_fl.pdfIn PDF document text
    • http://gufutaca5.xyz/gakiwulonotonipesodapudawom0p0.pdfIn PDF document text
    • http://wordwild-store.com/38147322366jlqp6.pdfIn PDF document text
    • https://cdn.sqhk.co/tavimuxeju/aihhahc/low_lying_cerebellar_tonsils_without_chiari_malformation.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/the_andromeda_strain_2008_part_2.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/ahrend_230.pdfIn PDF document text
    • http://vutajazelige.medianewsonline.com/55295894336.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/91536799439.pdfIn PDF document text
    • http://seweripuwas.mywebcommunity.org/capnodis_tenebrionis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_3a289120d8ca49559b7106157b9cdff9.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_6db0207c367c431b92796757c8c61856.pdf?index=trueIn PDF document text
    • http://votixeju.onlinewebshop.net/pdf_to_word_download_free_converter.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_02158105783d4fd5a73bf807146f110d.pdf?index=trueIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_32c1d19b33e749d1a85c3ae62dab2fee.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_b6a6fe856039450584b6e34b5e0778a0.pdf?index=trueIn PDF document text
    • http://vokesakogo.onlinewebshop.net/60986386858.pdfIn PDF document text
    • https://99f07d18-f615-4afc-a518-2230828c2232.filesusr.com/ugd/4cd51e_f2840cafbefd4eafa44c11064d74cdca.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_off0000c767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC767 5384 bytes
SHA-256: 47bbda9cd5391e5a67eaab2142f6fed0919ff9614538343bcb85791e55826090
font_01_sfnt_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 10084 bytes
SHA-256: 253a5b6984a282534131ed3a78a438feb1827893d960e3448fdf415ef20fcb65

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