Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c853cbe230bf09…

MALICIOUS

PDF

71.6 KB Created: 2020-10-06 10:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 91511c1b33b38ee9a153731f236e7f0c SHA-1: 676cdc1533e5b602538443efb0bc1d05d34eb939 SHA-256: 43c853cbe230bf09e018b13cc0b58a4cb49c3c622f300f2acc4a44a510e21e32
214 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ggtraff.ru/strik?keyword=ejercicios+de+distribucion+de+poisson+y+binomial In PDF document text
    • https://site-1036950.mozfiles.com/files/1036950/nixagaji.pdfIn PDF document text
    • https://site-1038980.mozfiles.com/files/1038980/tovenabe.pdfIn PDF document text
    • https://site-1039426.mozfiles.com/files/1039426/5250472090.pdfIn PDF document text
    • http://files.dtbellevue.com/uploads/1/3/1/8/131857920/2508907.pdfIn PDF document text
    • http://files.percevite.org/uploads/1/3/0/7/130739340/5645701.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6101a34-2e70-4336-be64-511c5a2f8fa8/mubamudew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f96572-f775-4ccc-8e7a-6fa51f36909a/zovonakemarenow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9beda6e5-9661-42cd-9770-a3780c5900dd/43470264115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b8bafa-c9da-4c95-a463-61bd8133b3a4/rarexofuguguzebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a25003-eb34-4afe-a9c1-df43b71e112d/38259847568.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7640/0792/files/88306347306.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8676/4446/files/national_chinese_honor_society_cord.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2551/7722/files/bosch_washing_machine_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7745/9363/files/54949925075.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFD 5492 bytes
SHA-256: 69455d5743adb7347ea75b2a6b58719d59d7f69e4aa0b48edad3f907b6e8c91f
font_01_sfnt_off0000cd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 14624 bytes
SHA-256: 07a87c7ab25a1dcd13aff5de098bcc55397de8ecc797f56268e4f81ecccdada7
font_02_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 16092 bytes
SHA-256: 92803e3ab3b76f3ed578428f3f17f1c5a821b71a0d5d2f83c94cb4946715d5c4

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