Malicious PDF — malware analysis report

Static analysis result for SHA-256 da22305cc238ee56…

MALICIOUS

PDF

49.3 KB Created: 2020-11-08 13:01:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 0beab4786a8ddaac755bfe48ab86b483 SHA-1: e8e88e3a5f3284a33cd5c3493fb488862c87684d SHA-256: da22305cc238ee56c9e0bcd4c666d64e368b8e392bdc2392b15ce44702bda4c2
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffset.ru/aws?keyword=wawa+franchise+opportunities+costs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414691/normal_5f9e7397c4468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_5f99635aad24e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://saxogaz.files.wordpress.com/2020/11/40303583913.pdfIn PDF document text
    • https://wudefuwutox.files.wordpress.com/2020/11/tibosopogun.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/windows_launcher_apk_android.pdfIn PDF document text
    • https://kiwowet.files.wordpress.com/2020/11/comparison_of_adverbs_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/jurnal_invertebrata_laut.pdfIn PDF document text
    • https://teviwuder.files.wordpress.com/2020/11/lofulevusi.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/easy_building_ideas_for_minecraft.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/wafugemina.pdfIn PDF document text
    • https://rabanebuvug.files.wordpress.com/2020/11/30421192975.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/74333328985.pdfIn PDF document text
    • https://batepej.files.wordpress.com/2020/11/flowchart_and_paragraph_proofs.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/arduino_mini_datasheet.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_off00007468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7468 5056 bytes
SHA-256: cfc045009f5b83e10b99302371e878c05e84b052231edf0b708cbf65fde00251
font_01_sfnt_off000085a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85A0 10744 bytes
SHA-256: 0fb9ed0ad9d1e238036765c74eda49ea8d8adf325e8c2e5df35ceb0e182d35ce
font_02_sfnt_off0000aa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA31 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f