Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a847cb975e847ec…

MALICIOUS

PDF

66.8 KB Created: 2021-01-10 21:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 68a0eb7d25369ad3710ecca82d298f43 SHA-1: 3c406053faf496a2b5e04ad2945499b78730588d SHA-256: 7a847cb975e847ec2c28dac881dfa0c5183259ff887e0086c8781a4c48e32dac
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/mozel?keyword=body+planes+and+anatomical+directions+worksheet In PDF document text
    • https://dodevapamoj.weebly.com/uploads/1/3/4/3/134352329/dumojawakaku.pdfIn PDF document text
    • https://site-1179802.mozfiles.com/files/1179802/wordbrain_2_buildings_4x5.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/lomuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412568/normal_5fedfee50fbcf.pdfIn PDF document text
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/e2134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5ff411714210b.pdfIn PDF document text
    • https://riwewupurudo.weebly.com/uploads/1/3/1/3/131381540/jajotu.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/hhJgjAF/55346195981.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxiniraz/xstjchf/fusobuninobudewiranobuz.pdfIn PDF document text
    • https://rudanivaxaf.weebly.com/uploads/1/3/4/4/134497940/kijapufex_detujugufagupez_zevotasix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/towakog/nokav.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/fajuzexabizekevej.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/nunoxepawusiwarefapaduf.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/80489485198.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_off0000c7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D2 5620 bytes
SHA-256: 79b2d1544d389b0420f583492a73aa11f0f87774754607f85f822da2d197236e
font_01_sfnt_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 9844 bytes
SHA-256: f257e1f87bbae0f19a50517e9a50f1c03104bb7f7bb47d31e1da8c91868497ab