Malicious PDF — malware analysis report

Static analysis result for SHA-256 81228f8aa44d1d1e…

MALICIOUS

PDF

74.7 KB Created: 2021-03-24 11:02:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0fc107686f901a4b663c53e27c511b3b SHA-1: 7ccf62c42988b1b91c667a9ab72d94b35a1a7142 SHA-256: 81228f8aa44d1d1e236832e9d8e5de110e28a1ba20859a998460436de8b34d73
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xezojetit.ru/award?keyword=valve+amplifiers+fourth+edition+pdf PDF link annotation
    • https://bijigixeze.weebly.com/uploads/1/3/0/7/130739450/6879697.pdfIn PDF document text
    • http://getcabinets.xyz/the_outsider_synopsis_episode_1p9px7.pdfIn PDF document text
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/bilim.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/rowumobifipisapiji.pdfIn PDF document text
    • https://fagozeku.weebly.com/uploads/1/3/4/5/134506452/25aa0182.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/cdl_test_espanol_california.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_60154e423b927.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/vofepafidezelitutikubor.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/7841652.pdfIn PDF document text
    • http://bnatural.space/drum_simulator_pc_freecwe3d.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/36431293718.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/simple_english_grammar_questions_and_answers.pdfIn PDF document text
    • https://zerakilun.weebly.com/uploads/1/3/2/6/132695460/komamoz_pogebizodi_vumakuzogi_javena.pdfIn PDF document text
    • https://xogiwudib.weebly.com/uploads/1/3/4/7/134715522/681f356.pdfIn PDF document text
    • http://ryukzak.digital/27256910037sk3ou.pdfIn PDF document text
    • https://vesizolakaz.weebly.com/uploads/1/3/4/3/134333528/zosidun.pdfIn PDF document text
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/gekemuxukawome.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/suxugunotajow.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/az-_300_exam_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412158/normal_60497bca0ccc9.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/figogepiwofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 5308 bytes
SHA-256: a68238e4bf3374d01a2d0b6119dcd95e50a73a2657fcba3b5fe0fd460bb5a61c
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 11184 bytes
SHA-256: 76ccf375ae390e0047640b4f9c8fb6ac764982a99d82ebb61571afb4ab762272