Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ced4b6064225284…

MALICIOUS

PDF

79.1 KB Created: 2021-05-12 06:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b0b4285cce7419e7b3d12f8f155f692d SHA-1: c2a7dace0630aa9b94b43f431bd73905df48dac6 SHA-256: 9ced4b606422528416493be71d5bb88d9464c6f7c3a11bf18dbc39ba2293ef42
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various PDF files hosted on disposable domains, such as http://fedatowuka.epizy.com/14697197358.pdf. The primary purpose appears to be directing users to potentially malicious content or phishing sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=kindergarten+pre+writing+worksheets+pdf PDF link annotation
    • https://sewarekim.weebly.com/uploads/1/3/4/3/134370683/4744400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_603c3e7a877fa.pdfIn PDF document text
    • https://wupibivuvofat.weebly.com/uploads/1/3/1/1/131164023/866427.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/9DfjfoP/overkill_3_game_guardian.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/b0d85e12fd7f1fc.pdfIn PDF document text
    • https://somukenevibo.weebly.com/uploads/1/3/4/5/134525583/dukebetulejuga_xikovuvosal.pdfIn PDF document text
    • https://fosijegaden.weebly.com/uploads/1/3/4/8/134868146/gobunebub.pdfIn PDF document text
    • https://titanukudolilip.weebly.com/uploads/1/3/6/0/136082060/5710569.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/kijchgo/visolonos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417818/normal_6008e207ec929.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/jckM7gj/fantasy_premier_league_gameweek_5_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/tagisojitilu/8hfibGG/philips_hue_motion_sensor_manual.pdfIn PDF document text
    • http://nonukel.iblogger.org/mapuzixaxazado.pdfIn PDF document text
    • https://cdn.sqhk.co/zoburawava/2qgjJih/xotisaxuxedit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472198/normal_604e79ebcb44f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedatowuka.epizy.com/14697197358.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/checkstyle-_idea_plugin.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/matavisedexiwibo.pdfIn PDF document text
    • http://gixoluzex.epizy.com/makkar_ielts_speaking_file.pdfIn PDF document text
    • http://pezusor.epizy.com/wunebo.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_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 5396 bytes
SHA-256: 4fc992d1be2eea9aa74674d6c757aee7821fb22f8e960fc82879a55cf21453df
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 11024 bytes
SHA-256: a6c6e2f59c0519e363905b873cc1acc986d2cb1850a4a2c715ea723fa6520e9f

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