Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d7988009733376…

MALICIOUS

PDF

73.1 KB Created: 2021-03-29 19:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 47d869c8fd4a5d53f489ccc8571dc924 SHA-1: b05033efcd2e1778d11bc1642abf86cf5e221f12 SHA-256: 87d7988009733376a87638eea3842029b1f55b9fc34466cd1dfbf06c6bdb26ae
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 0.9997

Heuristics 6

  • 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.
  • 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://ponafet.ru/strik?utm_term=computer+organization+and+design+5th+edition+chapter+4+solutions PDF link annotation
    • https://cdn.sqhk.co/noneniwetav/GViejjg/zifutafuz.pdfIn PDF document text
    • http://italy50wow.pro/what_jobs_can_i_do_with_an_accounting_and_finance_degreewycwk.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/frXwYge/nulobudexogafaxasoza.pdfIn PDF document text
    • http://gojepifega.22web.org/arcane_mage_pve_guide_8._0.pdfIn PDF document text
    • http://replyua.site/9975340575gzokm.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/JhiM8jc/82997002063.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/9nEa7Xr/39466990335.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/atG9gd2/89744433818.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/jipigegugajasadikarh636.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_a53353eff05b45acbd4782a204107ff2.pdf?index=trueIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_cce1319174fa4d1fbb35d6ea7d02889b.pdf?index=trueIn PDF document text
    • http://noxesufod.epizy.com/personality_disorder_test.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_34130e348a184a3c9796e545fcef0322.pdf?index=trueIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_678cb90d7ec946cfbbe00f5cbd951496.pdf?index=trueIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_0ea5735a8683467aac6f275575a913e8.pdf?index=trueIn PDF document text
    • http://pipiwilevo.rf.gd/oral_b_5000_cheapest_price.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_06c8a02a4dd04b07837c30c3f67e7671.pdf?index=trueIn PDF document text
    • http://sozunonu.epizy.com/73926161966.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_8f524a0e88d9431a8dbccbb8cac9cb37.pdf?index=trueIn PDF document text
    • http://godolefimew.epizy.com/10657338628.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 5656 bytes
SHA-256: 09f13b3962cf9656e7be64517e04ac59e84d111c85f063df60feb75d6d7df4a0
font_01_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 10200 bytes
SHA-256: 7892879dc0193b8dcfd067f4bdaff4b1f78250fbd5a35b92ce4b0071b9271c82

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