Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d863e85ac4d32ef…

MALICIOUS

PDF

80.9 KB Created: 2021-03-30 04:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ce4e7a91b3941303b5c567ca43e7ec58 SHA-1: 33bcb2a17dd9ad439dded31adcdf597205f9b9f3 SHA-256: 8d863e85ac4d32eface7a60d5eccc2707260fd7bb539d2e5063ebc875d23ad77
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a domain associated with phishing and malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to create a deceptive search result page. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/award?keyword=bronsted+theory+of+acids+and+bases+pdf PDF link annotation
    • http://blankid.ru/mogadeduxawumow4cgt8.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/OMEmqge/sawide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477877/normal_605d08d4661d1.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/jf8ifjc/knowledge_transfer_template_for_testing.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/J0id2KB/jordan_snakeskin_11_pink_shirt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478961/normal_6029e2bda9bc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_605d81d10fa2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_6028b1c409718.pdfIn PDF document text
    • http://krokoboko3.xyz/how_to_fix_a_stove_that_wont_heat_upghwhn.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/gizonukorad/how_to_connect_mini_dv_camcorder_to_tv.pdfIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_e3b5c804100845a1a4beb15f9d241a79.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_d12540b20cb243eba0b458f5e21ed894.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/bileiklerin_yaygn_adlar_ve_formlleri.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_d92b35c1c3534a1d9fdef5f9c1e7df07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/nugimed.pdfIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_61987503773a4aed989234e1ab297658.pdf?index=trueIn PDF document text
    • https://2aa0b900-127f-4603-a19a-6a731d3c9eb1.filesusr.com/ugd/5eaffa_201642785f434b879fa2ae0dee2e1030.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/traditional_folk_music_definition.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_9664a5fc80dc4e428d6893fbafde6884.pdf?index=trueIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_d57cd7f31b2144abae282aca2e242c5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/jagibebidi.pdfIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_f9bb1b7687de45dd8f8b359319f4ce4b.pdf?index=trueIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_703efc2b999c4a89bfb8bfb93ec94c34.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 5504 bytes
SHA-256: 124637cdefe9fd70dc3bda2a3f4a7871c62f23d645db47450706495d37fe22e9
font_01_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 11488 bytes
SHA-256: 91091674b98e7fb7e6b7b52afd69b86903a0dc23877c12a1c0a1ba366ed99d56

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