Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c923e776a3b958…

MALICIOUS

PDF

43.3 KB Created: 2020-10-01 09:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 910a89942dc78b643f33e56aa27ed439 SHA-1: 3a9738987d00f965003344c57b27ee512a0a33b6 SHA-256: f5c923e776a3b958a860431a6a4983efe422f1105f968d93d7cfaa3af69e28a5
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?keyword=kalender+2018+pdf+free+download In PDF document text
    • http://files.botanicalgardenphotography.com/uploads/1/3/0/7/130775241/zanubemowofox.pdfIn PDF document text
    • http://files.a1alarm1980.com/uploads/1/3/0/8/130814021/2fcbb45180d68d0.pdfIn PDF document text
    • http://files.blackandright.net/uploads/1/3/0/7/130775645/6315874.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/34409249482.pdfIn PDF document text
    • https://site-1036969.mozfiles.com/files/1036969/86962694603.pdfIn PDF document text
    • https://site-1038526.mozfiles.com/files/1038526/kokeje.pdfIn PDF document text
    • https://site-1039143.mozfiles.com/files/1039143/xafalatutunuvele.pdfIn PDF document text
    • http://xasaloj.bayhavencavaliers.com/uploads/1/3/2/6/132680896/1565164.pdfIn PDF document text
    • http://nazipozov.cliffgloverpottery.com/uploads/1/3/0/7/130740019/4473640.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/1/0441/0851/3432/files/picadura_de_garrapata_tratamiento_antibiotico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9730/3461/files/pifubadasemagogerotaki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1542/1600/files/dufevedupifunaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5404/6111/files/gelalereli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9785/7954/files/petitu.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_off00005e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2D 5096 bytes
SHA-256: ba016fb62e1270dd7d8610678723d9bdcbfb144d38533cd33453d31e5bcc9302
font_01_sfnt_off00006f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9C 10316 bytes
SHA-256: 3399caef661591dc9e5c898f16fa88aee0f8bc2e83bf1f4f0360bedd900d9561
font_02_sfnt_off0000925d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x925D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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