Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9e8356f063e457…

MALICIOUS

PDF

87.9 KB Created: 2021-04-01 14:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c24a5d45add125aff93d0457092ff324 SHA-1: 73d6cf92a55de7ca75a667a877784f7bdb8968aa SHA-256: 8f9e8356f063e4572e7eb917a50143325cee033a5589fb64211a2dbf2f3eb870
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://fokemale.ru/123?utm_term=script+template+login+php PDF link annotation
    • http://negifowutagur.mygamesonline.org/abecedario_en_cursiva_para_imprimir.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/65896350941.pdfIn PDF document text
    • https://sazekunoteti.weebly.com/uploads/1/3/2/7/132740187/gepepipamin.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/adverb_and_adverbial_phrases.pdfIn PDF document text
    • https://dodapufil.weebly.com/uploads/1/3/0/8/130813701/664f2c4d.pdfIn PDF document text
    • https://rominekajamarol.weebly.com/uploads/1/3/4/0/134040464/3757285.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_6a02ff71a78e4da2b1eef447a448e7f0.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_fe678031d64d4b79b1495d34de341ea0.pdf?index=trueIn PDF document text
    • http://fegoluvarelewum.myartsonline.com/designspark_magazine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c0e290a-cba6-4fa4-a16b-905db60fed70/db2_error_errorcode-4499_sqlstate58009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf464f2-e7d2-4497-b1b7-d0ec9b3dcf46/pali_canon_buddhism.pdfIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_4a6253750a0f48009f5fe521b56abfe4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/430df63b-ce49-4a7f-ad97-dba0a936785d/can_personal_credit_affect_business_credit.pdfIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_c3716b7cff08454d942ade49e795a413.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_379783e283eb4125b9539f12b6cf4716.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_66f6d49bbada4333b5cea4a1af0d80c0.pdf?index=trueIn PDF document text
    • https://6ae5a9c1-8526-45f7-b068-03ddf2465b28.filesusr.com/ugd/87f732_7fd8993e1c4f4e68b7f4ced5b32d1f2a.pdf?index=trueIn PDF document text
    • https://f9cb7010-568c-45d0-b0a5-7bd630b60272.filesusr.com/ugd/b10ea2_69d2eff40f0f4c328bee4a2a87baee8c.pdf?index=trueIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_1fab0a38c04542ccb304ba8ac4d7e9a9.pdf?index=trueIn PDF document text
    • http://desigaweru.myartsonline.com/ap_sachivalayam_books_download.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_ac35bdd4874c4ab39c4fcd6007b26687.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_2aaee0be1fed43d58acd81d7293d8979.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_b4c19850b15d4741b930a33ed19c93a7.pdf?index=trueIn 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_off00010d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D95 5060 bytes
SHA-256: 87eb6008df4e1f4db99cab39264a7bcb5c1fbf14560c7094803b20781768af39
font_01_sfnt_off00011e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E87 11016 bytes
SHA-256: cf3c329a6b4a8c2881a4e8944fdfc0681b27f0ca8f185c236d2f47aea27ea04a
font_02_sfnt_off00014436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14436 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333