Malicious PDF — malware analysis report

Static analysis result for SHA-256 88aaf83514063bcc…

MALICIOUS

PDF

36.7 KB Created: 2020-11-07 07:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 35c7ce2932b53a90cca8b9ff272cbe43 SHA-1: 8c140cd996f02366076b82c65c7713088ced18ff SHA-256: 88aaf83514063bccbc12f74877a0585507a0504e2bc8bc15d8e89c966ceba9ac
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/123?keyword=weight+and+mass+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380675/normal_5f907a1e5c5e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5f9fcd497ca81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_5f9775c90f8fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f9070422ae6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f9fe094278b4.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/649f81a8bfe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_5f9d721c39b6f.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/kivirumu_dadoxizure_tanoxobumamo_xilevajed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5fa372766c1b4.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/najubu/basic_technical_drawing_spencer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d365839a-de8f-4c34-a79d-d7968d84a9bc/5675497909.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/domer_domain_forum.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/vista_20_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/abdul_kalam_speech_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0994e34d-47bd-49ca-b9ca-5dc3960ec2e5/arizona_smog_check_history.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_off00005094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5094 5376 bytes
SHA-256: 634d9ed4d94b2f962de4a2f9773bd27d92aade2dffa815b4aea75073a8303ead
font_01_sfnt_off000062cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CB 10280 bytes
SHA-256: 42f4e092e0eb82db9172ec9e29bee70c55d9dc61851523e2a629c9f5988df837