Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d7bee88c269466…

MALICIOUS

PDF

80.6 KB Created: 2021-04-05 02:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3c3c5029a0431cdb8fbd7605846e37af SHA-1: 25f2140125c835ee4d1dbb0f06be052b36a84015 SHA-256: 25d7bee88c26946604232cb81c2f4482881568146e2d67a5df383c38f82c9558
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Kvs computer answer key 2018', indicating a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/123?utm_term=kvs+computer+answer+key+2018 PDF link annotation
    • https://cdn.sqhk.co/janawezexoj/crmg95Y/carrom_board_game_online_y8.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/carvedilol_vademecum.pdfIn PDF document text
    • https://cdn.sqhk.co/dudexobexine/jgq3Mje/domino_pizza_specials.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/kowamusofosalija.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/4226567094.pdfIn PDF document text
    • http://wuroguredogir.getenjoyment.net/dofonigorosi.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/fusionner_deux_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/0277ceeb-93d1-45ef-81b0-cf7b02c0398c/how_to_apply_for_partial_unemployment_wisconsin.pdfIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_330fbdc788fc4732870271e266705021.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_8ab6c1ca068448e8b794f826f4e10c45.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_4ad5974a33654851993321dfee1f7ec5.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_50e89ef72fa14c1a80c222415bb427a3.pdf?index=trueIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_10f3bede720247d598d13c36347b3912.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1cba889-8dee-4b58-aee3-1e6e59b90a75/33964315259.pdfIn PDF document text
    • https://34184745-b1ec-4725-b105-60c94cc90871.filesusr.com/ugd/63369f_afa73a8f140947b090745a2ac178ce52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72caad6-01d9-413d-893c-404ebc703a6a/kimorovibijazedudosik.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_e4cff77c904d4acebd583f879afc92c5.pdf?index=trueIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_bcb031e5b1b04797ae215a0f37ac9c14.pdf?index=trueIn PDF document text
    • https://78f5967e-1348-44d0-b43d-4fba71d4c3e7.filesusr.com/ugd/a94f6a_118176a8565a4f20a5911e104dbe8230.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de1623b-ae83-41ce-a949-93299d175d13/how_to_apply_for_state_id_in_hawaii.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_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 5856 bytes
SHA-256: 130e5becfc8c954e1b151341b36eb1565f2041377c150bd149718fe39af9777e
font_01_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 11604 bytes
SHA-256: b68a21e049b586962659f7c55294b6b8a97c9e7f09b081e04875d0223704fc22
font_02_sfnt_off000127ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 3296 bytes
SHA-256: 9a2f1a75f1e8506f68cb7c73edee09eef143a000b524261b1d9866ffed6bb0ec

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