Malicious PDF — malware analysis report

Static analysis result for SHA-256 987afab675aad6b0…

MALICIOUS

PDF

84.0 KB Created: 2021-03-18 09:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 26df57e7a0fbfa95e61bda47ee6a807f SHA-1: 728e0ff12a5b108ce3a99423f3a5a10a5b788873 SHA-256: 987afab675aad6b018664f765faa63efdedc9dab723e62aac453e117d64a18fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly subdomains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a tactic to drive traffic to various websites, likely for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://ponafet.ru/strik?utm_term=what+size+is+a+graco+pack+n+play+mattress PDF link annotation
    • https://pagukusiko.weebly.com/uploads/1/3/4/6/134631218/46a1f7280b0ac84.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/r3gejbg/bowling_pin_3d_model_free.pdfIn PDF document text
    • http://blubadgehelp.net/geometric_patterns_worksheet_4th_gradesja19.pdfIn PDF document text
    • http://m-ryanaf.site/effectual_entrepreneurship_definitionei2u3.pdfIn PDF document text
    • http://opensalon.xyz/a_streetcar_named_desire_1995_movie_watch_onlinee1hx7.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/bf7fa66bcd4795.pdfIn PDF document text
    • http://xaziligoto.22web.org/78945318913.pdfIn PDF document text
    • http://bullbananavannaone.xyz/should_you_read_the_bible_in_chronological_orderjpknv.pdfIn PDF document text
    • http://loxotuxer.22web.org/ford_mustang_shelby_gt500_for_sale_uk.pdfIn PDF document text
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/4d3524.pdfIn PDF document text
    • http://mmmuuuue.space/visapamgfkxo.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/dodudiduvezijowad.pdfIn PDF document text
    • https://jaduxokapatusiw.weebly.com/uploads/1/3/5/3/135301375/dimezorimupa.pdfIn PDF document text
    • https://cdn.sqhk.co/sezabaxo/thaggxJ/td_bank_us_business_account.pdfIn PDF document text
    • https://lefafikof.weebly.com/uploads/1/3/0/9/130969708/7526e1edf63966.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bapujuta.epizy.com/how_long_should_you_cook_chicken_on_a_george_foreman_grill.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_off000108f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 5576 bytes
SHA-256: bd26fa582ac6abff447396f39b31b2eafe6e78640828f6f7c4c5d02686a3dee8
font_01_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 10948 bytes
SHA-256: d36895546debbb2a416eb5bbad42f2d29bcd103aec00fed91a6bad02c5007f9f