Malicious PDF — malware analysis report

Static analysis result for SHA-256 65059e834bcabf5d…

MALICIOUS

PDF

71.1 KB Created: 2021-04-25 07:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bb163c2f6f50207bed0331a78ca40301 SHA-1: b091fa83be3a148756765bfb29654b109367565f SHA-256: 65059e834bcabf5d69e7fdc886a080cc1c1cf6d3279326e62942205e545384f9
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://zajinet.ru/strik?utm_term=diary+of+wimpy+kid+next+book PDF link annotation
    • https://xulewanexu.weebly.com/uploads/1/3/4/1/134108589/ab035a.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/P0KUidH/my_talking_tom_2_download_apk_uptodown.pdfIn PDF document text
    • https://bawobejeburojax.weebly.com/uploads/1/3/1/1/131163695/7971097.pdfIn PDF document text
    • http://bcipreactivaperu.com/magma_orb_buildunsbc.pdfIn PDF document text
    • https://votorivoxezi.weebly.com/uploads/1/3/4/0/134095847/1d553fec8214.pdfIn PDF document text
    • http://forecast.bet/bounce_classic_mod_apk_android_1qg8ic.pdfIn PDF document text
    • https://cdn.sqhk.co/nunagike/bzEgcsV/maid_of_honor_proposal_template.pdfIn PDF document text
    • http://itawegan.space/gsm_alarm_system_wireless_siren_setupnf54n.pdfIn PDF document text
    • http://bonusiotsbera.online/fefonowonerivelumejowibic3aq0.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/ekvgijd/pejoki.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/0458f1d7b85096e.pdfIn PDF document text
    • https://winateminapalem.weebly.com/uploads/1/3/4/0/134041456/jajudiwet.pdfIn PDF document text
    • https://rijopadanag.weebly.com/uploads/1/3/1/0/131070137/vizefu.pdfIn PDF document text
    • https://liropesab.weebly.com/uploads/1/3/1/4/131454219/nipuj.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/7jchjgi/11753293386.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/dheifhd/60211346377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b416d2a3-330e-4518-8f5e-c931256b4cd1.filesusr.com/ugd/5168b2_318f4ca59cf948eeb4f095cb0a7b13ee.pdf?index=trueIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_7bcd1d1cbd5941e68a59e04dba14689b.pdf?index=trueIn PDF document text
    • https://34fef40c-4934-4c56-b24d-59915ed92566.filesusr.com/ugd/806295_66b17968b07a41608928c5d24a495154.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_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 5440 bytes
SHA-256: 57c815be3d2aebbd2b4baf6f4b92627145387db5311fceaee75d55e8d3a09028
font_01_sfnt_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 10876 bytes
SHA-256: f50ddfb29f80f8757e838946e84c9ac7f39b731d0a57cca6ca80ed864d6ca0a8

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