Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a98b4650aa51dd…

MALICIOUS

PDF

56.9 KB Created: 2020-10-15 19:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 58cf1357652e5a87930a8d5ad2345c48 SHA-1: d901f17ae318c5af53660b370cf1d3bcd222d5ad SHA-256: 61a98b4650aa51dd67c590d7a85b81e66d15705cedef284e7565da4724a514db
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/123?keyword=reduce+the+size+of+a+pdf+mac In PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/3374443.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/womanawiwurek_dipewububexuti_tudanado.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/f638fda.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/5175717.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/caa64.pdfIn PDF document text
    • https://site-1037233.mozfiles.com/files/1037233/60790009073.pdfIn PDF document text
    • https://site-1043095.mozfiles.com/files/1043095/tewasanewibetukaru.pdfIn PDF document text
    • https://site-1041206.mozfiles.com/files/1041206/fallen_leaves_by_will_durant_free.pdfIn PDF document text
    • https://site-1040251.mozfiles.com/files/1040251/2648810213.pdfIn PDF document text
    • https://site-1040101.mozfiles.com/files/1040101/sadulegimuvine.pdfIn PDF document text
    • https://site-1039695.mozfiles.com/files/1039695/senolukizumumizerewibebur.pdfIn PDF document text
    • https://site-1041676.mozfiles.com/files/1041676/46236869017.pdfIn PDF document text
    • https://site-1040504.mozfiles.com/files/1040504/xipizilidegavonos.pdfIn PDF document text
    • https://site-1039513.mozfiles.com/files/1039513/lesajirakadikuwagub.pdfIn PDF document text
    • https://site-1044146.mozfiles.com/files/1044146/55716228478.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/9ba64029b4.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bigunurusipota_vovavubavuw_malolipesafa.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/1000608.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://cdn.shopify.com/s/files/1/0431/3281/3473/files/highland_lake_maine_boat_launch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4659/8816/files/pact_of_the_archfey_build.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7276/5083/files/python_html_to_with_javascript.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08637429-9ed4-4bd2-ac0a-193728cbcd3f/gitirisapugexawejupon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1215ce1c-76d4-4a1d-8bfa-7db2ca22feee/rogovadapetujev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c5c90a-614e-49a7-a1bf-e42f68e248c8/kuwelaxop.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000aa08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAA08 18884 bytes
SHA-256: 9dc202cfc050e2b4acc608c1af6a9223c6e88490b629567a5a37a1bb505a6ca7
font_00_sfnt_off000073fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73FB 5100 bytes
SHA-256: feff80cc3f5c2c2131e0abff4d9a828360a1aec40d03bd9a51d8a8afbdb46522
font_01_sfnt_off00008569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8569 10660 bytes
SHA-256: 83667b3f790e3cd6d2460f26bb371dc39a8ea5f7d09718f52cf4758f280290fd
font_03_sfnt_off0000c772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC772 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378