Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b48a13c76e0a639…

MALICIOUS

PDF

51.7 KB Created: 2020-11-06 01:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: a39e1a86f8752560587362e12c7e5e4d SHA-1: 21014811c2a065d68f7e375c0fa6197fffdb27e6 SHA-256: 2b48a13c76e0a639ef027e4b1e79d40211aef61fbb8a6f1ca05ff14b9e45f4e5
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=infiltrating+the+airship+apk+download PDF link annotation
    • https://jiwamotezonadiw.weebly.com/uploads/1/3/4/3/134325797/fobadogiv-sesunizawulotem-gipaguxasal-dupabagileku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5f88127379c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5f90091b5c7b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f89e47d06f10.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/kedejunovozutezu.pdfIn PDF document text
    • https://pokumajapemen.weebly.com/uploads/1/3/4/4/134490217/9316218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_5f91f70634502.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2678bf92-452e-4610-96c9-2ecc67d8d07b/loxinadusilopakojisufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb6ee88-cdcc-4100-95bf-0e9fbe3349cc/my_weird_school_aj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f99f774e-a69a-401b-a18d-1ab24b86d087/fogenidafolilokonoxusen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef72884-be49-481e-8899-b4f14df5ff8d/68573248067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e61eaa-aca5-4099-b3e2-7e2c38b67a2e/bitlife_mod_apk.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59A4 5184 bytes
SHA-256: 4319a745fead43856ea35d01c954fb8fdad10fb72347eceb99d00afb5731d95d
font_01_sfnt_off00006b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3B 10280 bytes
SHA-256: e3f171ff70db17b110753af0bb73f0dbf21cab428074794890f585ad55496acd
font_02_sfnt_off00008842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8842 13452 bytes
SHA-256: b092dc1f0135ecfe45a9c84f6fc49e702d8de860491b0f836b2288f800c13374
font_03_sfnt_off0000b202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB202 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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