Malicious PDF — malware analysis report

Static analysis result for SHA-256 992a7e4f1845249e…

MALICIOUS

PDF

54.8 KB Created: 2020-11-06 20:05:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: c2968fdb4640f9a17f73f4ec0eb8f71d SHA-1: 08dab181859a266ed9118571caeca80e0ec0e709 SHA-256: 992a7e4f1845249e440f1a0b3c185657b0e0419d5c4b4b75451422d122f45296
144 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?keyword=directions+fort+lauderdale+to+south+beach PDF link annotation
    • https://fumubesoxumus.weebly.com/uploads/1/3/4/4/134485348/zotubafopoxol.pdfIn PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/e037825e3645c.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/misog.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/gezetega/gre_pool_of_argument_topics_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f5c13b-0997-4335-8b0c-2b2c085ac3b0/49429983749.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/413631117.pdfIn PDF document text
    • https://xopesop.files.wordpress.com/2020/11/83160693904.pdfIn PDF document text
    • https://s3.amazonaws.com/fasotajedag/gatehouse_electronic_keypad_deadbolt_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64fff3d-a11f-46c8-b78b-06bb47abbf26/degevikatikifekakat.pdfIn PDF document text
    • https://sebuwisawos.files.wordpress.com/2020/11/fipupojuretis.pdfIn PDF document text
    • https://fizafadolozu.files.wordpress.com/2020/11/31713389540.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/black_diamond_cosmo_headlamp_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/92705804224.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/17158432464.pdfIn PDF document text
    • https://gexaxigos.files.wordpress.com/2020/11/27818923572.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74CD 5248 bytes
SHA-256: 9131b9f8c81ee957534d5c5c7ad9318280d20dc90f849d0008b1d65a611207d0
font_01_sfnt_off00008696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8696 2468 bytes
SHA-256: 568eb3b77136d73513310814a1ae052360461b5a8f9cb10c5d69170f2e8dc6cd
font_02_sfnt_off00009128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9128 11108 bytes
SHA-256: 9a6709353f0d4452a35fc5db27a1fa659b462a1dfd5a4ac964e0270ba897b5e9
font_03_sfnt_off0000b75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75A 16652 bytes
SHA-256: d7906c586705aa77f65cb9b199a4cf1bfb1dd5675034edc4d808bf1bd23970f5

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