Malicious PDF — malware analysis report

Static analysis result for SHA-256 647041bf571e7d28…

MALICIOUS

PDF

79.8 KB Created: 2021-03-20 01:23:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b92a30484eacdfdde495cb99c35fa3cb SHA-1: c818d5ca61b28754ff8aa57a913d7b1644d0e1c5 SHA-256: 647041bf571e7d289fafb14aceb5c0c8a6a1a38e6cc3bd494c9d1938e6445d1b
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 0.9993

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://nipisod.ru/123?utm_term=gilded+age+presidents+worksheet PDF link annotation
    • http://7lessons.site/adverbs_of_time_exercises_with_answersm6e52.pdfIn PDF document text
    • http://flowerport.store/nifubamafijerutetabadida5jjaj.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/aadf9.pdfIn PDF document text
    • http://promoocaoameericanas.com/where_can_i_get_a_sodastream_gas_refillm6ol0.pdfIn PDF document text
    • https://genaxixa.weebly.com/uploads/1/3/1/4/131437685/9334765.pdfIn PDF document text
    • https://cdn.sqhk.co/xapejinogum/Chegdji/70553766573.pdfIn PDF document text
    • https://lurafavef.weebly.com/uploads/1/3/0/8/130813461/bc5f1f16aa6d0.pdfIn PDF document text
    • http://fasad-dom.site/vovebejozeliaaf1y.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/bazag.pdfIn PDF document text
    • http://fixetufuzafix.22web.org/how_to_become_a_trim_carpenter.pdfIn PDF document text
    • http://yesitalia.fun/what_is_the_computer_hardware_and_software_give_few_examplesorvg2.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/lesur.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/ezd6jcB/yeezy_boost_350_v2_zebra_fake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favigawesuwevo.rf.gd/theories_of_deviance.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/what_is_i_love_you_in_all_languages.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_decf1c02265f4ddc94a0fe058420d8f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/39892171428.pdfIn PDF document text
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_34c01c91da194da584b6cf749ce8dd91.pdf?index=trueIn PDF document text
    • http://mopezuvo.epizy.com/movenuramerisegiduf.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/27465864638.pdfIn PDF document text
    • https://69f7c7ec-f776-4f8b-90c4-e8126cd531e3.filesusr.com/ugd/772020_2493f27c69e14a188a04993ca196ad27.pdf?index=trueIn PDF document text
    • http://kopixagelaje.rf.gd/bidofabazelubatavavume.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/auxiliary_view_problems_with_solutions.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_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 5408 bytes
SHA-256: 58fe902010ea368375b9c641dc9193741788bcaede62ae3e3d445a5058e99666
font_01_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 10944 bytes
SHA-256: 68f8c2567a172882c86c1ecb73acc4a0322739a76cac68a1fe3196ce0c41028c

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