Malicious PDF — malware analysis report

Static analysis result for SHA-256 6952eee8d8df9abe…

MALICIOUS

PDF

78.4 KB Created: 2021-03-20 20:55:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3636f10dff80af56a640621537b92f1b SHA-1: 0698831e035c64e1255cf4f533e740f780110080 SHA-256: 6952eee8d8df9abe9b41651d3935bac7f2e7aa8866fe5bf2b3d793b633d68901
196 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including PDF_SEO_LINK_FARM and PDF_SUSPICIOUS_LINK_LURE, pointing to suspicious domains. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://seumenha.ru/wix?keyword=harvest+moon+animal+parade+friendship+guide
    • https://cdn.sqhk.co/xuteposidobi/iNdgcO9/birthday_cake_ideas_uk.pdf
    • https://cdn.sqhk.co/pilozarager/jehgX6g/dragon_hunters_full_movie_english.pdf
    • http://flowerport.market/quantitative_data_analysis_reportvnlrd.pdf
    • https://cdn.sqhk.co/pabelewexo/jjJhjij/68673133826.pdf
    • https://cdn.sqhk.co/duwefetufe/aBjc6AN/armored_car_222.pdf
    • https://cdn.sqhk.co/nujoxodove/hiyOjam/didagogom.pdf
    • http://figebofisekozoj.22web.org/safokodujigojif.pdf
    • http://ig-supportcenter.xyz/cash_drawer_count_sheet_template_freeuzswe.pdf
    • http://nncucuucuc.space/jijemefg03i.pdf
    • http://patimezo.22web.org/how_to_fix_a_brother_ls-2125_sewing_machine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_5ae29e3f82404bb88fee24615c023d1e.pdf?index=true
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_1c0260c3a46f4ec4877b17be9e58dde3.pdf?index=true
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_17a680a82a504a54b7ba33ffefce91cc.pdf?index=true
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_597b8a1644a34aa4b3eee0cb6016e046.pdf?index=true
    • http://fikuputo.epizy.com/ek_chiraiya_ghosle_ko_ringtone.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98e.bin
977ea80fe1d4999bfdd8baa22a464cd907054cc3472f228bf45d4aa0c7eb874a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 5360 bytes
font_01_sfnt_off0000fb9d.bin
5565de7fece01149309f959743717c0a55fba6aa1a72f7604c7b27367ec89e9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 10128 bytes
font_02_sfnt_off00011e59.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 4324 bytes

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