Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e93b5a63f9ee1e…

MALICIOUS

PDF

76.5 KB Created: 2021-05-09 19:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 201b75dd4309ffe6068cea31e7ed4944 SHA-1: 5428bc58f91efdfdbc65c33a57febb8c966e16d3 SHA-256: 12e93b5a63f9ee1ea4983c53286ef9f11ccb74e2dcb3e44811b30ecad22202d3
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://crophysi.ru/strik?utm_term=large+printable+map+of+new+york+state PDF link annotation
    • https://cdn.sqhk.co/noxomosanena/RihYAhk/24805665247.pdfIn PDF document text
    • http://just-gopro.com/72938091318hu9e3.pdfIn PDF document text
    • http://huaweistoreukr.xyz/words_their_way_upper_elementary_spelling_inventory_sentencesa8xav.pdfIn PDF document text
    • https://cdn.sqhk.co/tiluzegata/f5XX3AX/notes_payable_debit_or_credit_normal_balance.pdfIn PDF document text
    • http://youla-24.cc/gununuxuvobunx2kha.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/igrhied/arrow_pointing_downwards_then_curving_rightwards.pdfIn PDF document text
    • http://indonesia2health.online/91296792346mbwhl.pdfIn PDF document text
    • http://milansit.space/hp_blackberry_android_2019dst8e.pdfIn PDF document text
    • http://braco.ru/tekukunafetugukapu8qwpw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_2c570026b1b5445bbf9209fc940dd246.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/critical_ops_latest_hack_apk.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_7794cb92925743db9fd4306ecfe34126.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/43529621982.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_b2a729ecd7b845abaabc94483d7029a6.pdf?index=trueIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_c2ff0843f30547cd9818ea720f2295d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/selim.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/grade_11_english_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/67568830214.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/braden_risk_assessment_scale.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_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 5560 bytes
SHA-256: 968b5c0e9aeae01a05ef24dd3ad8297569f703fe8c0de161878e3e978e388dfc
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 11136 bytes
SHA-256: dec1f56b0bd1c8e20463fa37eddc0e82717f81b98b944a2f7dc3011ab01c2f8f

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