Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b8654834693553…

MALICIOUS

PDF

43.9 KB Created: 2020-10-26 13:00:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 31615e22f4f94f7e26004917cfa5d52f SHA-1: 3d27820a65e24f05ad07f7ef71787858234c20cb SHA-256: f8b86548346935530a124d0454cb6e8efbb8e9beadc6f8238ed0f2aa39d3caca
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?keyword=cell+differentiation+in+plants+pdf In PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/5805724.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/keneres.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/takirak.pdfIn PDF document text
    • https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/bddd9da68de.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/nusinasariruruna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/gidukexiz.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/97974382148.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/63503172831.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/ansys_apdl_tutorial_for_composite_materials.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/80376203206.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/tozutexalojuvoxemikame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7464b807-8fb9-43e4-acc1-0a49ba4fc93d/free_hd_movie_download_hollywood_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b734118-7432-47bd-9939-94ae79bfc148/91443397043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b57358b-bddf-4834-a5a6-3958a8afc1d3/indoor_shrimp_farming_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c528da-f6fe-4147-987b-c01696deb0ba/tinekowogamin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd6bb1d-e2af-47e6-9352-b765ef97e966/78009011964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f845608-5ef4-40ac-b967-aa44f4205b9e/73013611357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d364523-987b-4dd1-8e2c-628b0c8acf5e/78029006543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1256517-47f0-4eee-827d-09efe5c2e526/love_island_season_2_game_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb44254b-80c9-4f5e-9008-c3f98acae989/68392729848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e772da8-87e1-4058-9def-960d59797e32/tupuraji.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/madugesegiwozuruliwofiku.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/78626465512.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/tajokikalexejifekifuwevas.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_off00006ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA4 4940 bytes
SHA-256: 7b7a329b21b70aac636faedbd4a89f804521fadb4f9da0f80ce1acb1b3679bb4
font_01_sfnt_off00007f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F73 10024 bytes
SHA-256: ac9cd8c7e3530b290a174213f0a4d4973f285c110a970913de6414cc1378488c