Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bb51444b78aa22…

MALICIOUS

PDF

34.9 KB Created: 2020-10-26 17:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 0524b5b7866e5911bfad11f8d181dfbc SHA-1: e862e3c3469aa66f0a589bbb753bba0263dfe7e8 SHA-256: c0bb51444b78aa222c4318dc3da76f04e13dcefaba7b464e83b03599d6b22277
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=agriculture+in+india+tamil+pdf In PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/994144.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/f33a172c23f1.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/tebasalogezis.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/2164756.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/lerawoneli-gokuduguretaz.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/mirisisejek_sulize.pdfIn PDF document text
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/7651608.pdfIn PDF document text
    • https://nimewoguvinu.weebly.com/uploads/1/3/4/4/134433183/449689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f8d27a8d46e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f8fa5dce6c2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_5f8e8c71ba841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f871f7f30236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f8ebfc646910.pdfIn PDF document text
    • https://murudogukezopo.weebly.com/uploads/1/3/4/3/134320821/fodunozirapu.pdfIn PDF document text
    • https://vajibudutoneraz.weebly.com/uploads/1/3/4/3/134345344/pigaliluvimem.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00004e59.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00004e59.bin)
    • https://s3.amazonaws.com/ninazarila/split_by_page_range.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/spring_time_yiruma_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/ncert_class_12_chemistry_notes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/borges_y_yo_facundo_cabral.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/ferujonebuxasufe.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 extracted file (font_00_sfnt_off00004e59.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E59 5284 bytes
SHA-256: 361a19e0b0fe247ced0f3efa423abba8ad493009f452c70660eb74c9c2f646c0
font_01_sfnt_off00006039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6039 8824 bytes
SHA-256: b1f52dc72e508f9da64a6bb91eb0e4d1cc33e2221ce51990c3fef6c3f5dab190