Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2137557d91edb51…

MALICIOUS

PDF

40.7 KB Created: 2020-09-10 21:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b781a4c02fefdd5dbeb41cd5564c18fe SHA-1: 809b0a525e226483f94ccfb6989fd90be21ac926 SHA-256: d2137557d91edb510208419d1c31f4d1ef9708b853b091b367c9db386cdd8b9b
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://ttraff.club/pify?keyword=partners+in+performance+interview+process In PDF document text
    • http://digoba.indigoacresfarm.com/uploads/1/3/1/8/131856143/toxoworelodi.pdfIn PDF document text
    • http://files.weichengstat.com/uploads/1/3/2/3/132302780/2047928.pdfIn PDF document text
    • http://files.littleinspirationsmn.com/uploads/1/3/1/1/131164052/giloxu-rozup-lalexupuzazu.pdfIn PDF document text
    • http://sateg.hartlandcommunitychapel.org/uploads/1/3/2/6/132695643/lulopa-gijijosinoveto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/65e777_fe2ae173f2e945b091bf8a3bd2d5c42f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/805d2a_e9441d3f43d34dfcb8af4d8d424b5621.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/fb41f9_91d8f04bf9594d7da909715a40fb1060.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/576447_1eac659c6c5146b983844216eaf124ab.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/963627_8125096ac5044dfebf61e1c983822c1b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/dofipokanapopupixijinot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/3584/0932/files/bpp_acca_f7_financial_reporting_book_2017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/75888237678.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c8df25_a3ad1ee781454ef4b2f8749c82cf90a9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c5d40f_e8739161b3af4dc89082091932e7e9eb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/86319b_ba3b5a70370f460c8a063f36cbaed7d4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_8bcff15cfa1c4370b1d950ab64693aab.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1c8c6c_d620ccf7b57141dda93627f65b204600.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_off00006143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6143 5280 bytes
SHA-256: 17c7509cbe235a3c5831626b8c79ed82ce18ab57dce1c661942c99e680857089
font_01_sfnt_off00007339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7339 10216 bytes
SHA-256: 66c1091d1ecab95023a3430ff4a54dff6e0bb5112ec0b9fcd2af9d038e675b74

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