Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8899d69312db06…

MALICIOUS

PDF

89.7 KB Created: 2021-03-14 12:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d35f6c8763445970ef1099b306262f31 SHA-1: 8bbd7707ac525ae1863ed868561567df44004686 SHA-256: ab8899d69312db06296681fbe94deab59e8f349bb9ac1ea6f08c30299653a138
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 0.9990

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://druttle.ru/wix?keyword=writing+inequalities+worksheet+7th+grade PDF link annotation
    • http://summ-ita.space/amplitude_modulation_experiment_reportnzb4s.pdfIn PDF document text
    • http://bunnygummy.ru/singular_and_plural_irregular_nounsmevf8.pdfIn PDF document text
    • http://koteyarn.moscow/textbook_probability_and_statisticsj2o7e.pdfIn PDF document text
    • http://xxlmature.site/norse_mythology_bookrdbp1.pdfIn PDF document text
    • http://lalashoppen.online/infrastructure_capacity_management_template08sjn.pdfIn PDF document text
    • http://choosenews.space/sales_agreement_template_philippinesdhgz9.pdfIn PDF document text
    • http://itsnat.space/tepedotugikodagijojazlso07.pdfIn PDF document text
    • http://small-italy.space/kaossilator_pro_reviewsf1ui.pdfIn PDF document text
    • http://uber-global.com/74615441352lhhj9.pdfIn PDF document text
    • http://zathkatow.xyz/reset_ink_pad_epson_l5190kqnet.pdfIn PDF document text
    • http://kusulapezep.iblogger.org/how_much_is_a_round_bale_of_hay_worth.pdfIn PDF document text
    • http://alex-chekalev.com/rotopewusedavalawoxizivato7n.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/44811521061s854k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepexivir.epizy.com/rivugofapolojubo.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/can_i_netflix_to_apple_tv.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_69a5d918cd3e4d948b571badf9b4877f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ditiruz/in_formal_letter_subject.pdfIn PDF document text
    • http://womunek.rf.gd/allied_school_uniform_for_playgroup.pdfIn PDF document text
    • http://zozoramotuwiv.rf.gd/annabel_lee_poem_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/luxap.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_95395d0b9a114de5a78d85ce1d4dc8cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/strength_training_routine_gym_machines.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/papelobudebosilirogukur.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 5460 bytes
SHA-256: 34b2816f3f4a7b5ebad483110ac585842eb7d227813f04614db4e3f1c7c853ff
font_01_sfnt_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 11272 bytes
SHA-256: f4f7ea3bbb2bced842b271d5939ce641225307b29a18617ccf5e5af64f854690
font_02_sfnt_off00014405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14405 16084 bytes
SHA-256: 12e1bdea5fc73f205daff8bbc4573b4c6e5ba94205cf5b3440f65e61b625f0f0

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