Malicious PDF — malware analysis report

Static analysis result for SHA-256 4935073d837cf92c…

MALICIOUS

PDF

47.2 KB Created: 2020-10-13 23:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f97be60e5dac87661fa1ed24d0028f75 SHA-1: 511c86a8b94931ff776bf3e070d99eb9e98dbd09 SHA-256: 4935073d837cf92c6537dcce47f3fec3b789969affbfd1d9fa7fb5d744a64fa3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded URLs, many of which are hosted on disposable domains and redirect to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a link farm designed to manipulate search engine results, likely to distribute malware. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs suggest a phishing or malware distribution attempt.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=1st+grade+esl+worksheets In PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/sijuwoxujupid.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/32e063a95e.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1696278.pdfIn PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/63677815819.pdfIn PDF document text
    • https://site-1038892.mozfiles.com/files/1038892/46115600428.pdfIn PDF document text
    • https://site-1043565.mozfiles.com/files/1043565/kofegisasagofota.pdfIn PDF document text
    • https://site-1037848.mozfiles.com/files/1037848/96241556198.pdfIn PDF document text
    • https://site-1036929.mozfiles.com/files/1036929/3931426588.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://uploads.strikinglycdn.com/files/79905cd9-ceed-4f70-97c8-077b4cb0314f/84421255300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dab2d98-b1c7-4c2b-b68f-0edbc58e7a3d/17724442762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a7cbcbc-c990-4a52-a1e1-f59113ac8ae0/5761730728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7d98d9-5c98-4b6b-85b7-83cd1c515f2d/nuvugosuloxixefizugad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63747d6-a51a-4035-a15d-8f7ff994c169/tumafomajofuwifanebo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9493/8271/files/fidatesonewanobi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4660/1372/files/r-pod_dealers_near_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2126/5828/files/gixome.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_off00006db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB4 4832 bytes
SHA-256: 35a885a068c577bbbbb2fb5945b41c54c37f171492580ed8217e536d10290cc2
font_01_sfnt_off00007e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E41 10252 bytes
SHA-256: dd251d0c2a14ea701bb7892395eb24eef1dc22b10c42986bc250e7790d6086f8
font_02_sfnt_off0000a152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA152 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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