Malicious PDF — malware analysis report

Static analysis result for SHA-256 953cf6c3c78f9989…

MALICIOUS

PDF

39.3 KB Created: 2020-10-26 08:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 82a82a4c808c729df144e424edbc1ee8 SHA-1: 896bbfb889e85b5d6d7167de0bc5aaff72f76c31 SHA-256: 953cf6c3c78f998937b938a3096d6086b5d23a65b87d128a3d2bedfaa6182d81
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'care instructions' and includes the malicious URL, suggesting a lure to external malicious content.

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://ggtraff.ru/123?keyword=care+instructions+symbols+vector In PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/kexamali_gipaz_zewixaberobax.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9653445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5f8b021ebaf22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5f8c57d7ec2d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5f8dee636f395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5f90dcbaddb89.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/174fd1b5f85.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/bibesekukemugedovofa.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/7707936.pdfIn PDF document text
    • https://vurofagulomefu.weebly.com/uploads/1/3/1/4/131452840/2592974.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3562/3076/files/ancient_civilizations_crossword_puzzle_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0136/8735/files/santa_fe_dehumidifier_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1486/5575/files/nulunis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0878/9150/files/poetry_analysis_worksheet_7th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8589/8938/files/15666780104.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/saxon_advanced_mathematics_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/rolazisubepuzifajevixaxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/rozeforanesi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8937/2329/files/41907396089.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8409/3884/files/convertir_un_a_word_online_gratis.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_off00005a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2E 5152 bytes
SHA-256: 9137eb33e55ed6d0cb91f79dac4be243b5e6c47745ad24a4521b1e04e05cb3b9
font_01_sfnt_off00006ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA9 10640 bytes
SHA-256: 682c146ca0ee9fde1044c73aaa587f21c0f0a4fd21c9cc83e2749e656073d8ad