Malicious PDF — malware analysis report

Static analysis result for SHA-256 c663fa39aa496bd7…

MALICIOUS

PDF

77.3 KB Created: 2021-02-23 20:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ff4bd0ebe726c58cdfa4d0390e9f317d SHA-1: 1f4628fa657c58eab244ee542d5bcbdb047f3caf SHA-256: c663fa39aa496bd7af87d75dff765b717eb21e6602f71a0af172f18a37573680
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary lure appears to be a fake search result for accounting test answers, directing users to a malicious URL.

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://jottigo.ru/wix?keyword=accounting+chapter+10+test+answer+key PDF link annotation
    • https://cdn.sqhk.co/jigekuragige/mgghfhT/binoxofe.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/Cjhhg7T/long_almond_shaped_nail_designs.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/chB9ggl/flip_flops_womens_arch_support.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/icUieEx/84466977640.pdfIn PDF document text
    • http://sumomubidisuwo.iblogger.org/root_explorer_android_free.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/vhhBtii/adobe_illustrator_draw_apk_download_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fudowoxalukiki.rf.gd/14760373613.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/letters_and_sounds_gov.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/fact_family_worksheets_division.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/gns3_vm_install_guide.pdfIn PDF document text
    • http://litopuputorer.rf.gd/fipovatibivunoz.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/comics_code_authority_guidelines.pdfIn PDF document text
    • http://menutewewunidov.rf.gd/plt.plot_set_marker_size.pdfIn PDF document text
    • http://nisinukodepafix.rf.gd/braun_wheelchair_lift_manual_operation.pdfIn PDF document text
    • http://nuxiluruzijova.epizy.com/apj_abdul_kalam_full_form_bangla.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/judofiw.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/fotiwibo.pdfIn PDF document text
    • http://fidajakafitota.epizy.com/proximos_dias_festivos_en_usa.pdfIn PDF document text
    • http://bobiwaj.rf.gd/592386345.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 5604 bytes
SHA-256: 11fe0f366c7b62296fb5f343461f0c597b01991ef46b6be1cd4f81e0add6bfe9
font_02_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 10488 bytes
SHA-256: 83946610c7cf26406f4c4b32e587677ef130a58896b74ed2c01a96e893359a5e

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