Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc64fffc87408447…

MALICIOUS

PDF

106.6 KB Created: 2021-01-25 08:52:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 38b101c7f033039f23d6e5e74063655b SHA-1: ebd59d9f5e6a309516acdc07c1eec06de406618a SHA-256: cc64fffc874084470faa37837a0051f6e6d565a4c700511b17a0dc3d615a9be6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown reputation URLs support this. The document body, though heavily obfuscated, contains a reference to 'Hardware components of a computer worksheet', likely a lure.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/aws?utm_term=hardware+components+of+a+computer+worksheet PDF link annotation
    • https://cdn.sqhk.co/zejegure/byjjicj/swords_and_sandals_2_redux_hacked_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/egcIjij/rolling_sky_level_1000.pdfIn PDF document text
    • http://private-channel.site/outstanding_balance_vs_total_amount_duem83fi.pdfIn PDF document text
    • http://ita-yog.space/cod_mobile_lucky_draw_cost_singapores1gqp.pdfIn PDF document text
    • http://reweder.site/carrom_board_powder_chemical_namenv8j0.pdfIn PDF document text
    • https://cdn.sqhk.co/wukikanas/ib7KCH0/walmart_microban_products.pdfIn PDF document text
    • http://rubyshup.space/54682931717lyhnv.pdfIn PDF document text
    • http://kadabafomelu.66ghz.com/facebook_funny_videos_clips.pdfIn PDF document text
    • http://rudeniwabirever.iblogger.org/pigikifepitabiba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwagof.rf.gd/9_cadrans_de_l_abdomen.pdfIn PDF document text
    • http://dajejat.rf.gd/bowel_cancer_screening_guidelines_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/74841650191.pdfIn PDF document text
    • http://waraxiv.rf.gd/15355443360.pdfIn PDF document text
    • http://tinijev.epizy.com/74773151125.pdfIn PDF document text
    • http://zopegekole.rf.gd/26763110948.pdfIn PDF document text
    • http://vipaviveza.epizy.com/ielts_writing_vocabulary_band_9.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/jeverirabowefunaxa.pdfIn PDF document text
    • http://vowafipefazasex.epizy.com/beers_criteria_2019_pocket_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/tatudenanamunenoguk.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_off00015bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCF 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off000165ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165CA 5480 bytes
SHA-256: 3fcaec4dd02488e97f328ab72634f258d7ee07d7afd818fa1a0c73bb51f6fdaa
font_02_sfnt_off00017859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17859 10016 bytes
SHA-256: 20fd1955f6ae97f74ca08c0b60c0d537fe27f60896a0d3ba6409a7fe5b539c35

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