Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8bd9852a878207…

MALICIOUS

PDF

76.1 KB Created: 2021-02-19 16:29:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fef19bdb882a36e6c6b14137ab34b027 SHA-1: b2b5e1fc8a4ec44125bae9c6ac1558d9e4244b5a SHA-256: ac8bd9852a87820750b3e9d989ccbeda7d7f54ecefcf9567cb831d51d3acd112
126 Risk Score

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 0.9998

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 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://seumenha.ru/123?utm_term=how+to+sync+fios+tv+one+remote+to+tv PDF link annotation
    • https://cdn.sqhk.co/zanivuwiduvo/kiahfgI/space_bowling_novi_sad_cene.pdfIn PDF document text
    • https://wagemerefav.weebly.com/uploads/1/3/2/7/132712282/sedumafijegig.pdfIn PDF document text
    • http://takovod.66ghz.com/45365783512.pdfIn PDF document text
    • https://cdn.sqhk.co/ramejolir/wjhjgeD/digi_clock_widget_plus_apk_full.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/fXigfZG/toca_life_farm_free_download_apk.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/7236a4541e6dd.pdfIn PDF document text
    • http://legalvictory.group/mutitebikubabiwag26w5l.pdfIn PDF document text
    • https://revuduxaj.weebly.com/uploads/1/3/5/3/135333309/b5a290175f.pdfIn PDF document text
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/zinaf.pdfIn PDF document text
    • https://sekitajed.weebly.com/uploads/1/3/1/3/131383533/33484.pdfIn PDF document text
    • http://itmax.info/the_steel_shaft_has_a_diameter_of_40_mm_and_is_fixed_at_its_ends_a_and_b._gst__75_gpap71kh.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/balloon_bubble_gamebc1r2.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxonukifi/gjhjPjd/pejefifulepizafafopavew.pdfIn PDF document text
    • http://pumba-timon.space/jatibov3dh6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sesijesule/in_case_of_emergency_form_template_free.pdfIn PDF document text
    • http://bodufusuviv.epizy.com/bootstrap_registration_form_template_with_validation.pdfIn PDF document text
    • http://piterar.epizy.com/37770426867.pdfIn PDF document text
    • http://duxupupin.epizy.com/speed_test_software_filehippo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 4788 bytes
SHA-256: 9b1c01eaffc91461da61373921167ff2dd43f1a861c00897299e6e6b978ce4c9
font_01_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 10528 bytes
SHA-256: 90373122688e8b84b90af381150957a4aea76c98ed6f77fff64458d0a15dd4c1
font_02_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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